[firebase-release] Manual - Removed change log and reset repo after 2.4.0 release (#226)

Update localized gstatic CDN links from 2.3.0 to 2.4.0.

Author: bojeil-google

README.md

@@ -62,17 +62,17 @@ Localized versions of the widget are available through the CDN. To use a localiz
 localized JS library instead of the default library:
 
 ```html
-<script src="https://www.gstatic.com/firebasejs/ui/2.3.0/firebase-ui-auth__{LANGUAGE_CODE}.js"></script>
-<link type="text/css" rel="stylesheet" href="https://www.gstatic.com/firebasejs/ui/2.3.0/firebase-ui-auth.css" />
+<script src="https://www.gstatic.com/firebasejs/ui/2.4.0/firebase-ui-auth__{LANGUAGE_CODE}.js"></script>
+<link type="text/css" rel="stylesheet" href="https://www.gstatic.com/firebasejs/ui/2.4.0/firebase-ui-auth.css" />
 ```
 
 where `{LANGUAGE_CODE}` is replaced by the code of the language you want. For example, the French
 version of the library is available at
-`https://www.gstatic.com/firebasejs/ui/2.3.0/firebase-ui-auth__fr.js`. The list of available
+`https://www.gstatic.com/firebasejs/ui/2.4.0/firebase-ui-auth__fr.js`. The list of available
 languages and their respective language codes can be found at [LANGUAGES.md](LANGUAGES.md).
 
 Right-to-left languages also require the right-to-left version of the stylesheet, available at
-`https://www.gstatic.com/firebasejs/ui/2.3.0/firebase-ui-auth-rtl.css`, instead of the default
+`https://www.gstatic.com/firebasejs/ui/2.4.0/firebase-ui-auth-rtl.css`, instead of the default
 stylesheet. The supported right-to-left languages are Arabic (ar), Farsi (fa), and Hebrew (iw).
 
 ### Option 2: npm Module

changelog.txt

@@ -1,8 +1 @@
-removed - Removes hard coded QUOTA_EXCEEDED phone auth error. Instead we will use whatever the Auth API returns.
-feature - Updates the FirebaseUI demo app to install as a standalone PWA when added to home screen on an Android device.
-feature - Support prefilling the default phone number by passing a loginHint in the configuration only when phone auth provider is the only provider.
-feature - Support prefilling the default national number along with default country only when phone auth provider is the only provider.
-changed - Updates saucelabs tests: replace Safari 6 with 7 and removes IE9.
-fixed - Uses session persistence when supported on the internal temporary auth instance to avoid dangling auth states.
-fixed - Modified reCAPTCHA "I am not a Robot" button to be more responsive in narrow screens.
-feature - Adds a continue button to redirect to the continueUrl if available in the password reset and email verification action widgets.
+