docs: Updating contribution docs to source README.md directly

Signed-off-by: Francisco Javier Arceo <farceo@redhat.com>

docs/source/building_applications/rag.md

@@ -1,4 +1,4 @@
-## Using Retrieval Augmented Generation (RAG)
+## Retrieval Augmented Generation (RAG)
 
 RAG enables your applications to reference and recall information from previous interactions or external documents.
 
@@ -162,3 +162,8 @@ for vector_db_id in client.vector_dbs.list():
     print(f"Unregistering vector database: {vector_db_id.identifier}")
     client.vector_dbs.unregister(vector_db_id=vector_db_id.identifier)
 ```
+
+### Supported Data Types
+
+You can ingest data into the vector database using `RAGDocument` objects.
+The supported mime types (https://en.wikipedia.org/wiki/Media_type#mime.types) data types are:

docs/source/contributing/index.md

@@ -1,14 +1,14 @@
-# Contributing to Llama Stack
 
-Start with the [Contributing Guide](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md) for some general tips. This section covers a few key topics in more detail.
+```{include} ../../../CONTRIBUTING.md
+```
+
+See the [Adding a New API Provider](new_api_provider.md) which describes how to add new API providers to the Stack.
+
 
-- [Adding a New API Provider](new_api_provider.md) describes adding new API providers to the Stack.
-- [Testing Llama Stack](testing.md) provides details about the testing framework and how to test providers and distributions.
 
 ```{toctree}
 :maxdepth: 1
 :hidden:
 
 new_api_provider
-testing
 ```