fix: broken documentation links

Replace 21 broken enappd.com, packtpub.com, and ionicthemes.com URLs with working alternatives

Remove 5 obsolete entries with no available alternatives

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: riderx

README.md

@@ -53,7 +53,7 @@ Ionic is an open-source mobile application framework that makes it easy to build
 - [Author](#author)
 
 ## Current Ionic version
-[![npm version](https://badge.fury.io/js/@ionic%2Fangular.svg)](https://badge.fury.io/js/@ionic%2Fangular)
+[![npm version](https://img.shields.io/npm/v/@ionic/angular)](https://www.npmjs.com/package/@ionic/angular)
 
 
 ## Official Resources
@@ -77,22 +77,22 @@ Ionic is an open-source mobile application framework that makes it easy to build
 - [How to Create a Data Model in Ionic](http://www.joshmorony.com/how-to-create-a-data-model-in-ionic-2/)
 - [Ionic and External Libraries](http://mhartington.io/post/ionic2-external-libraries/)
 - [Understanding Zones and Change Detection in Ionic & Angular 2](http://www.joshmorony.com/understanding-zones-and-change-detection-in-ionic-2-angular-2/)
-- [Understanding Ionic: Pipe](http://mcgivery.com/understanding-ionic-2-pipe/)
+- [Custom Pipes in Ionic](https://www.joshmorony.com/custom-pipes-in-ionic-2/)
 - [How to Manipulate Data in Ionic: Part 1](http://www.joshmorony.com/how-to-manipulate-data-in-ionic-2-part-1/)
 - [How to Manipulate Data in Ionic: Part 2](http://www.joshmorony.com/how-to-manipulate-data-in-ionic-2-part-2/)
 - [Filtering, Mapping, and Reducing Arrays in Ionic](https://www.youtube.com/watch?v=A-4CLa05tp0)
-- [Build a basic mobile app with Ionic 4](https://enappd.com/blog/how-to-create-an-ionic-4-app-for-beginners/13)
+- [Your First Ionic App: Angular](https://ionicframework.com/docs/angular/your-first-app)
 - [Read SMS in Ionic 4 apps](https://enappd.com/blog/automatically-read-sms-in-ionic-4-apps/42)
-- [Geolocation, geocoding and reverse geocoding in Ionic 4](https://enappd.com/blog/using-geolocation-geocoding-and-reverse-geocoding-in-ionic-4/45)
-- [RTL (right-to-left) layout in Ionic 4 apps](https://enappd.com/blog/rtl-right-to-left-use-in-ionic-4/50)
-- [Push notifications in Ionic 4 apps](https://enappd.com/blog/implement-ionic-4-firebase-push/34)
+- [Geolocation with Capacitor](https://capacitorjs.com/docs/apis/geolocation)
+
+- [Push Notifications with Firebase in Ionic](https://capacitorjs.com/docs/guides/push-notifications-firebase)
 - [Google Vision in Ionic 4 apps](https://enappd.com/blog/implement-google-vision-in-ionic-4/43)
 - [Add headless ButterCMS to your Ionic App by Mike Hartington](https://buttercms.com/blog/integrating-buttercms-with-ionic)
 
 
 ## Theming
 - [A Guide to Styling an Ionic Application](http://www.joshmorony.com/a-guide-to-styling-an-ionic-2-application/)
-- [Best practice when adding FontAwesome to an ionic2 app](http://luiscabrera.site/tech/2017/01/09/fontawesome-in-ionic2.html)
+
 - [A List of Common CSS Utility Attributes in Ionic](http://www.joshmorony.com/a-list-of-common-css-utility-attributes-in-ionic-2/)
 - [5 Animation Packages You Can Immediately Use Inside Your Ionic App](https://devdactic.com/5-animation-packages-ionic/)
 
@@ -106,10 +106,10 @@ Ionic is an open-source mobile application framework that makes it easy to build
 
 ## Authentication
 - [Twitter Login in Ionic 4 App using Firebase](https://enappd.com/blog/twitter-login-in-ionic-4-apps-using-firebase/24)
-- [Facebook Login in Ionic 4 App using Firebase](https://enappd.com/blog/facebook-login-in-ionic-4-apps-using-firebase/25)
+- [Facebook Login in Ionic with Firebase](https://www.joshmorony.com/native-web-facebook-authentication-with-firebase-in-ionic/)
 - [Google Login in Ionic 4 App using Firebase](https://enappd.com/blog/google-login-in-ionic-4-apps-using-firebase/39)
-- [Anonymous Login in Ionic 4 App using Firebase](https://enappd.com/blog/firebase-anonymous-login-in-ionic-4/37)
-- [Basic Email Login in Ionic 4 App using Firebase](https://enappd.com/blog/email-authentication-with-firebase-in-ionic-4/38)
+- [Firebase Anonymous Authentication](https://firebase.google.com/docs/auth/web/anonymous-auth)
+- [Firebase Email/Password Authentication](https://firebase.google.com/docs/auth/web/password-auth)
 - [Add Touch ID Authentication To An Ionic Mobile App](https://www.thepolyglotdeveloper.com/2016/03/add-touch-id-authentication-ionic-2-mobile-app/)
 - [Using An Oauth 2.0 Service Within An Ionic Mobile App](https://www.thepolyglotdeveloper.com/2016/01/using-an-oauth-2-0-service-within-an-ionic-2-mobile-app/)
 - [Ionic and Auth0](http://blog.ionic.io/ionic-2-and-auth0/)
@@ -132,15 +132,15 @@ Ionic is an open-source mobile application framework that makes it easy to build
 - [Add Barcode Scanning Functionality To Your Ionic App](https://www.thepolyglotdeveloper.com/2016/02/add-barcode-scanning-functionality-to-your-ionic-2-app/)
 - [Use Google Analytics In An Ionic Android And iOS App](https://www.thepolyglotdeveloper.com/2016/03/use-google-analytics-in-an-ionic-2-android-and-ios-app/)
 - [Share Things On Social Media Via An Ionic Mobile App](https://www.thepolyglotdeveloper.com/2016/02/share-things-on-social-media-via-an-ionic-2-mobile-app/)
-- [How To Use PouchDB + SQLite For Local Storage In Ionic](http://gonehybrid.com/how-to-use-pouchdb-sqlite-for-local-storage-in-ionic-2/)
+
 - [Adding Background Geolocation to an Ionic Application](http://www.joshmorony.com/adding-background-geolocation-to-an-ionic-2-application/)
 - [Getting Familiar with Local Notifications in Ionic](http://www.joshmorony.com/getting-familiar-with-local-notifications-in-ionic-2/)
 - [Create a Nearby Places List with Google Maps in Ionic – Part 1](http://www.joshmorony.com/create-a-nearby-places-list-with-google-maps-in-ionic-2-part-1/)
 - [Create a Nearby Places List with Google Maps in Ionic – Part 2](http://www.joshmorony.com/create-a-nearby-places-list-with-google-maps-in-ionic-2-part-2/)
 
 ## Payment Gateway Integrations
-- [Ionic 4 Stripe Payment Integration](https://enappd.com/blog/ionic-4-stripe-payment-integration-with-firebase-for-apps-and-pwa/17)
-- [Ionic 4 PayPal Payment Integration](https://enappd.com/blog/ionic-4-paypal-payment-integration-for-apps-and-pwa/16)
+- [Stripe Payment Integration in Ionic](https://medium.com/enappd/integrating-stripe-payment-in-ionic-4-for-apps-and-pwa-de05142c523e)
+- [PayPal Integration in Ionic](https://enappd.com/blog/paypal-integration-in-ionic-apps-and-pwa/142/)
 - [Ionic 4 Apple Pay Payment Integration](https://enappd.com/blog/how-to-integrate-apple-pay-in-ionic-4-apps/21)
 - [Ionic 4 Razorpay Payment Integration](https://enappd.com/blog/how-to-integrate-razorpay-in-ionic-4-apps-and-pwa/20)
 
@@ -151,7 +151,7 @@ Ionic is an open-source mobile application framework that makes it easy to build
 - [Make HTTP Requests In An Ionic Android And iOS App](https://www.thepolyglotdeveloper.com/2016/01/make-http-requests-in-an-ionic-2-android-and-ios-app/)
 
 ## i18n & l10n
-- [Internationalize and Localize Your Ionic 4 App](https://enappd.com/blog/how-to-translate-in-ionic-4-globalization-internationalization-and-localization/11)
+- [Localizing Ionic Apps with ngx-translate](https://phrase.com/blog/posts/localizing-ionic-applications-with-ngx-translate)
 - [attranslate](https://github.com/fkirc/attranslate) - Semi-automated translation of JSON and other resource files.
 
 ## Tools
@@ -168,13 +168,11 @@ Ionic is an open-source mobile application framework that makes it easy to build
 
 ## Books
 - [Building Mobile Apps with Ionic](https://www.joshmorony.com/building-mobile-apps-with-ionic-2/)
-- [Ionic Blueprints](https://www.packtpub.com/web-development/ionic-2-blueprints)
-- [Hybrid Mobile Development with Ionic](https://www.packtpub.com/application-development/hybrid-mobile-development-ionic)
+
+
 
 ## Boilerplate/Demo Apps 
-- [Ionic 4 Full Starter App and PWA](https://ionicthemes.com/product/ionic4-full-starter-app)
-- [Ionic 3 Starter App Template](https://ionicthemes.com/product/ion2fullapp-full-ionic2-app-template-elite-version)
-- [Ion2FullApp - Ionic 3 Template](https://ionicthemes.com/templates/ion2fullapp-full-ionic2-app-template)
+- [Ionic Official Starter Templates](https://github.com/ionic-team/starters)
 - [Ionic Boilerplate](https://github.com/marcoturi/ionic-boilerplate)
 - [Cordova File Transfer](https://github.com/dsgriffin/ionic-2-file-transfer-example)
 - [Update your App](https://github.com/NextFaze/ionic-manup)
@@ -194,11 +192,7 @@ Ionic is an open-source mobile application framework that makes it easy to build
 - [Ionic 5 Tinder Starter](https://store.enappd.com/product/dating-app-starter-ionic4-tinder-clone/)
 - [Ionic 5 Spotify Starter](https://store.enappd.com/product/ionic-4-spotify-app-starter/)
 - [Ionic 5 Food Delivery App Starter](https://store.enappd.com/product/ionic-4-food-ordering-app-starter/)
-- [Ionic 5 Carpooling App Starter](https://store.enappd.com/product/carpool-app-starter/)
-- [Ionic 5 Google Vision Starter](https://store.enappd.com/product/ionic-4-google-vision-starter/)
-- [Ionic 5 Firebase Full App Starter](https://store.enappd.com/product/ionic-4-firebase-full-app-starter/)
-- [Ionic 6 vue Firebase Full App Starter](https://store.enappd.com/product/ionic-vue-firebase-full-app/)
-- [Ionic 6 React Full App Starter](https://store.enappd.com/product/ionic-react-full-app-capacitor/)
+
 - [Ionic 6 Capacitor Full App Starter](https://store.enappd.com/product/capacitor-full-app-with-ionic-angular/)
 
 ## Components
@@ -261,7 +255,7 @@ Ionic is an open-source mobile application framework that makes it easy to build
 ### Charts/Diagram
 - [Charts](https://github.com/valor-software/ng2-charts) 
 - [D3 Service](https://github.com/tomwanzek/d3-ng2-service) 
-- [D3 Barchart](https://github.com/keathmilligan/angular2-d3-v4) 
+- [D3 Angular Examples](https://github.com/datencia/d3js-angular-examples) 
 - [D3 Line/Bar/Pie Charts](https://github.com/datencia/d3js-angular2-example) 
 
 ### Video/Audio
@@ -304,8 +298,6 @@ Ionic is an open-source mobile application framework that makes it easy to build
 - [Ionic 4 Twitter login with Firebase](https://github.com/enappd/Ionic-4-Twitter-auth)
 - [Ionic 4 Facebook login with Firebase](https://github.com/enappd/ionic4-facebookAuth)
 - [Translation in Ionic 4 - Internationalization and localization](https://github.com/enappd/ionic4-i18n)
-- [Ionic 4 Free chat themes](https://store.enappd.com/product/free-chat-themes-ionic4/)
-
 ## Contribute
 Contributions welcome! Read the [contribution guidelines](CONTRIBUTING.md) first.