Add list of hooks to each documentation page

Author: chrisbianca

auth/README.md

@@ -2,6 +2,8 @@
 
 React Firebase Hooks provides a convenience listener for Firebase Auth's auth state. The hook wraps around the `firebase.auth().onAuthStateChange()` method to ensure that it is always up to date.
 
+- [useAuthState](#useauthstateauth)
+
 ## `useAuthState(auth)`
 
 Parameters:

database/README.md

@@ -6,6 +6,12 @@ Firebase Realtime Database. The hooks wrap around the `firebase.database().ref()
 In addition to returning the list or value, the hooks provide an `error` and `loading` property
 to give a complete lifecycle for loading and listening to the Realtime Database.
 
+- [useList](#uselistref)
+- [useListKeys](#uselistkeystref)
+- [useListVals](#uselistvalstref-keyfield)
+- [useObject](#useobjectref)
+- [useObjectVal](#useobjectvaltref)
+
 ## `useList(ref)`
 
 Parameters:

firestore/README.md

@@ -12,6 +12,15 @@ There are 2 variants of each hook:
 - `useX` which subscribes to the underlying Collection or Document and listens for changes
 - `useXOnce` which reads the current value of the Collection or Document
 
+- [useCollection](#usecollectionquery-options)
+- [useCollectionOnce](#usecollectiononcequery-options)
+- [useCollectionData](#usecollectiondatatref-idfield)
+- [useCollectionDataOnce](#usecollectiondataoncetref-idfield)
+- [useDocument](#usedocumentdocref)
+- [useDocumentOnce](#usedocumentoncedocref)
+- [useDocumentData](#usedocumentdatatref)
+- [useDocumentDataOnce](#usedocumentdataoncetref)
+
 ## `useCollection(query, options)`
 
 Parameters:

storage/README.md

@@ -6,6 +6,8 @@ Firebase Cloud Storage. The hooks wrap around the `firebase.storage().ref().getD
 In addition to returning the download URL, the hooks provide an `error` and `loading` property
 to give a complete lifecycle for loading from Cloud Storage.
 
+- [useDownloadURL](#usedownloadurlref)
+
 ## `useDownloadURL(ref)`
 
 Parameters: