feat(react-native): Add push notification docs

Author: cshfang

public/images/push-notifications/cross-platform-lifecycle/pn-lifecycle-background.png

@@ -648,11 +648,6 @@ export const directory = {
       'push-notifications': {
         title: 'Push Notifications',
         items: [
-          {
-            title: 'Overview',
-            route: '/lib/push-notifications/overview',
-            filters: ['react-native']
-          },
           {
             title: 'Getting started',
             route: '/lib/push-notifications/getting-started',
@@ -668,14 +663,29 @@ export const directory = {
             route: '/lib/push-notifications/record-notifications',
             filters: ['ios']
           },
+          {
+            title: 'Request permissions',
+            route: '/lib/push-notifications/request-permissions',
+            filters: ['react-native']
+          },
+          {
+            title: 'Interact with notifications',
+            route: '/lib/push-notifications/interact-with-notifications',
+            filters: ['react-native']
+          },
           {
             title: 'Identify user',
             route: '/lib/push-notifications/identify-user',
-            filters: ['android', 'ios']
+            filters: ['android', 'ios', 'react-native']
+          },
+          {
+            title: 'App badge count',
+            route: '/lib/push-notifications/app-badge-count',
+            filters: ['react-native']
           },
           {
-            title: 'Working with API',
-            route: '/lib/push-notifications/working-with-api',
+            title: 'Enable rich notifications',
+            route: '/lib/push-notifications/enable-rich-notifications',
             filters: ['react-native']
           },
           {
@@ -691,7 +701,7 @@ export const directory = {
           {
             title: 'Setting up push notification services',
             route: '/lib/push-notifications/setup-push-service',
-            filters: ['android', 'ios']
+            filters: ['android', 'ios', 'react-native']
           }
         ]
       },

public/images/push-notifications/cross-platform-lifecycle/pn-lifecycle-foreground.png

@@ -1,8 +1,9 @@
-* An Android application targeting at least Android SDK API level 24 with Amplify libraries integrated
-    * For a full example of creating Android project, please follow the [project setup walkthrough](/lib/project-setup/create-application)
+- An Android application targeting at least Android SDK API level 24 with Amplify libraries integrated
+  - For a full example of creating Android project, please follow the [project setup walkthrough](/lib/project-setup/create-application)
 
+import fcmPreReq from '/src/fragments/lib/push-notifications/android/getting_started/fcm-pre-req.mdx';
 
-Push Notifications are delivered via Firebase Cloud Messaging (FCM), In order to use FCM, you need to register your app on the Firebase console. See [Setting up push notification services](/lib/push-notifications/setup-push-service/) for more information.
+<Fragments fragments={{ android: fcmPreReq }} />
 
 ## Request Permissions