[docs][core] apps

docs/core/app.md

@@ -1,21 +1,21 @@
-# App - firebase.app(): FirebaseApp
+## Apps
 
-RNFirebase supports both initializing apps natively and also via js code over the RN bridge.
+?> For the **default** app see: [Default App](/core/default-app)
 
-Apps initialized natively are available immediately at app runtime, there is no need to call `initializeApp` for them.
+?> For initializing **additional apps** natively and also via js code over the RN bridge see: [Dynamically Initializing Apps](/core/initialize-apps)
 
-For example, to access the default app initialized via the `Google-Services` `plist` or `json` file:
+### Reading App Options
+
+!> `<app>.options.clientId` is not available on the **Android Firebase SDK** so will return null for Android, see the issue: [firebase/firebase-ios-sdk#140 (comment)](https://github.com/firebase/firebase-ios-sdk/issues/140#issuecomment-315953708)
+
+Just like the Firebase web sdk you can view options used to initialize an app instance in the same way, for example:
 
 ```js
 import firebase from 'react-native-firebase';
 
 const defaultApp = firebase.app();
 
-defaultApp.database().ref('foobar').once('value', (snapshot) => {
-  // snapshot from default app
-});
-
-// get the default app name/options that were initialized natively
+// get the default app name/options that the app initialized with
 console.log("name", defaultApp.name);
 console.log("apiKey", defaultApp.options.apiKey);
 console.log("applicationId", defaultApp.options.applicationId);
@@ -26,9 +26,3 @@ console.log("storageBucket", defaultApp.options.projectId);
 ```
 
 
-<!-- TODO api ref docs: -->
- <!-- - name: String -->
- <!-- - options: Object -->
- <!-- - delete(): Promise -->
-
-

docs/core/firebase.md

@@ -1,9 +1,10 @@
 # Firebase
 
-<!-- TODO api ref docs -->
-<!-- TODO - apps(): Array<FirebaseApp> -->
-<!-- TODO - app(): FirebaseApp -->
-<!-- TODO - initializeApp(): FirebaseApp -->
-<!-- TODO - setLogLevel() -->
-<!-- TODO - SDK_VERSION: String -->
-<!-- TODO - googleApiAvailability: Object -->
+TODO Reference Docs:
+
+- apps(): Array<FirebaseApp>
+- app(): FirebaseApp
+- initializeApp(): FirebaseApp
+- setLogLevel()
+- SDK_VERSION: String
+- googleApiAvailability: Object

docs/index.html

@@ -45,11 +45,11 @@
     ],
   }
 </script>
-<script>
-  if (typeof navigator.serviceWorker !== 'undefined') {
-    navigator.serviceWorker.register('sw.js')
-  }
-</script>
+<!--<script>-->
+  <!--if (typeof navigator.serviceWorker !== 'undefined') {-->
+    <!--navigator.serviceWorker.register('sw.js')-->
+  <!--}-->
+<!--</script>-->
 <link rel="stylesheet" href="//unpkg.com/docsify/themes/vue.css">
 <style>
   .markdown-section pre>code {