chore: Implementing API Documenter workflow for generating API references (#1272)

* chore: Implementing API Documenter based docs pipeline

* chore: Cleaned up the post processing script

* fix: Updated RTDB and Firestore docs

* fix: Improved text

* fix: Enabling -s suffix mode for namespace files

Author: hiranya911

.gitignore

@@ -18,4 +18,4 @@ test/resources/apikey.txt
 # Release tarballs should not be checked in
 firebase-admin-*.tgz
 
-docgen/html/
+docgen/markdown/

docgen/content-sources/node/HOME.md

@@ -0,0 +1,12 @@
+## External API Re-exports
+
+The following externally defined APIs are re-exported from this module entry point for convenience.
+
+|  Symbol | Description |
+|  --- | --- |
+|  [DataSnapshot](https://firebase.google.com/docs/reference/js/firebase.database.DataSnapshot) | `DataSnapshot` type from the `@firebase/database` package. |
+|  [EventType](https://firebase.google.com/docs/reference/js/firebase.database#eventtype) | `EventType` type from the `@firebase/database` package. |
+|  [OnDisconnect](https://firebase.google.com/docs/reference/js/firebase.database.OnDisconnect) | `OnDisconnect` type from the `@firebase/database` package. |
+|  [Query](https://firebase.google.com/docs/reference/js/firebase.database.Query) | `Query` type from the `@firebase/database` package. |
+|  [Reference](https://firebase.google.com/docs/reference/js/firebase.database.Reference) | `Reference` type from the `@firebase/database` package. |
+|  [ThenableReference](https://firebase.google.com/docs/reference/js/firebase.database.ThenableReference) | `ThenableReference` type from the `@firebase/database` package. |

docgen/content-sources/node/toc.yaml

@@ -0,0 +1,27 @@
+## External API Re-exports
+
+The following externally defined APIs are re-exported from this module entry point for convenience.
+
+|  Symbol | Description |
+|  --- | --- |
+|  [BulkWriter](https://googleapis.dev/nodejs/firestore/latest/BulkWriter.html) | `BulkWriter` type from the `@google-cloud/firestore` package. |
+|  [BulkWriterOptions](https://googleapis.dev/nodejs/firestore/latest/global.html#BulkWriterOptions) | `BulkWriterOptions` type from the `@google-cloud/firestore` package. |
+|  [CollectionGroup](https://googleapis.dev/nodejs/firestore/latest/CollectionGroup.html) | `CollectionGroup` type from the `@google-cloud/firestore` package. |
+|  [CollectionReference](https://googleapis.dev/nodejs/firestore/latest/CollectionReference.html) | `CollectionReference` type from the `@google-cloud/firestore` package. |
+|  [DocumentData](https://googleapis.dev/nodejs/firestore/latest/global.html#DocumentData) | `DocumentData` type from the `@google-cloud/firestore` package. |
+|  [DocumentReference](https://googleapis.dev/nodejs/firestore/latest/DocumentReference.html) | `DocumentReference` type from the `@google-cloud/firestore` package. |
+|  [DocumentSnapshot](https://googleapis.dev/nodejs/firestore/latest/DocumentSnapshot.html) | `DocumentSnapshot` type from the `@google-cloud/firestore` package. |
+|  [FieldPath](https://googleapis.dev/nodejs/firestore/latest/FieldPath.html) | `FieldPath` type from the `@google-cloud/firestore` package. |
+|  [FieldValue](https://googleapis.dev/nodejs/firestore/latest/FieldValue.html) | `FieldValue` type from the `@google-cloud/firestore` package. |
+|  [Firestore](https://googleapis.dev/nodejs/firestore/latest/Firestore.html) | `Firestore` type from the `@google-cloud/firestore` package.  |
+|  [FirestoreDataConverter](https://googleapis.dev/nodejs/firestore/latest/global.html#FirestoreDataConverter) | `FirestoreDataConverter` type from the `@google-cloud/firestore` package. |
+|  [GeoPoint](https://googleapis.dev/nodejs/firestore/latest/GeoPoint.html) | `GeoPoint` type from the `@google-cloud/firestore` package. |
+|  [Query](https://googleapis.dev/nodejs/firestore/latest/Query.html) | `Query` type from the `@google-cloud/firestore` package. |
+|  [QueryDocumentSnapshot](https://googleapis.dev/nodejs/firestore/latest/QueryDocumentSnapshot.html) | `QueryDocumentSnapshot` type from the `@google-cloud/firestore` package. |
+|  [QueryPartition](https://googleapis.dev/nodejs/firestore/latest/QueryPartition.html) | `QueryPartition` type from the `@google-cloud/firestore` package. |
+|  [QuerySnapshot](https://googleapis.dev/nodejs/firestore/latest/QuerySnapshot.html) | `QuerySnapshot` type from the `@google-cloud/firestore` package. |
+|  [Timestamp](https://googleapis.dev/nodejs/firestore/latest/Timestamp.html) | `Timestamp` type from the `@google-cloud/firestore` package. |
+|  [Transaction](https://googleapis.dev/nodejs/firestore/latest/Transaction.html) | `Transaction` type from the `@google-cloud/firestore` package. |
+|  [WriteBatch](https://googleapis.dev/nodejs/firestore/latest/WriteBatch.html) | `WriteBatch` type from the `@google-cloud/firestore` package. |
+|  [WriteResult](https://googleapis.dev/nodejs/firestore/latest/WriteResult.html) | `WriteResult` type from the `@google-cloud/firestore` package. |
+|  [setLogFunction](https://googleapis.dev/nodejs/firestore/latest/global.html#setLogFunction) | `setLogFunction` function from the `@google-cloud/firestore` package. |