docs: update provider links to help setup for firebase auth

Author: russellwheatley

GETTING_STARTED.md

@@ -36,30 +36,18 @@ dependencies {
 
 ## Provider configuration
 
-Some providers need additional setup before you can sign users in.
-
-### Google Sign-In
-
-- Enable Google Sign-in in the Firebase console.
-- Add your app's SHA fingerprint in Firebase.
-- Download the updated `google-services.json`.
-- `AuthProvider.Google(..., serverClientId = null)` can use the `default_web_client_id` generated by the `google-services` Gradle plugin.
-
-### Facebook Login
-
-If you support Facebook Login, add these values to `strings.xml`:
-
-```xml
-<resources>
-    <string name="facebook_application_id" translatable="false">YOUR_FACEBOOK_APP_ID</string>
-    <string name="facebook_login_protocol_scheme" translatable="false">fbYOUR_FACEBOOK_APP_ID</string>
-    <string name="facebook_client_token" translatable="false">YOUR_FACEBOOK_CLIENT_TOKEN</string>
-</resources>
-```
-
-### Other providers
-
-Apple, GitHub, Microsoft, Yahoo, Twitter, and custom OAuth providers are configured in Firebase Authentication. Most of them do not require extra Android-specific resources.
+Some providers need additional setup before you can sign users in:
+- [Sign in with Google](https://firebase.google.com/docs/auth/android/google-signin)
+- [Facebook Login](https://firebase.google.com/docs/auth/android/facebook-login)
+- [Sign in with Apple](https://firebase.google.com/docs/auth/android/apple)
+- [Sign in with Twitter](https://firebase.google.com/docs/auth/android/twitter-login)
+- [Sign in with Github](https://firebase.google.com/docs/auth/android/github-auth)
+- [Sign in with Microsoft](https://firebase.google.com/docs/auth/android/microsoft-oauth)
+- [Sign in with Yahoo](https://firebase.google.com/docs/auth/android/yahoo-oauth)
+
+### Providers
+
+Apple, GitHub, Microsoft, Yahoo, Twitter and custom OAuth providers are configured in Firebase Authentication. Most of them do not require extra Android-specific resources.
 
 ## Sign in