docs: Add documentation on how to contribute a Vector DB provider and update testing documentation (#3093)

# What does this PR do?

- Adds documentation on how to contribute a Vector DB provider.
- Updates the testing section to be a little friendlier to navigate.
- Also added new shortcut for search so that `/` and `⌘ K` or `ctrl+K`
trigger search


<img width="1903" height="1346" alt="Screenshot 2025-08-11 at 10 10
12 AM"
src="https://github.com/user-attachments/assets/6995b3b8-a2ab-4200-be72-c5b03a784a29"
/>

<img width="1915" height="1438" alt="Screenshot 2025-08-11 at 10 10
25 AM"
src="https://github.com/user-attachments/assets/1f54d30e-5be1-4f27-b1e9-3c3537dcb8e9"
/>

<!-- If resolving an issue, uncomment and update the line below -->
<!-- Closes #[issue-number] -->

## Test Plan
<!-- Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.* -->

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

docs/source/conf.py

@@ -131,6 +131,7 @@ html_static_path = ["../_static"]
 def setup(app):
     app.add_css_file("css/my_theme.css")
     app.add_js_file("js/detect_theme.js")
+    app.add_js_file("js/keyboard_shortcuts.js")
 
     def dockerhub_role(name, rawtext, text, lineno, inliner, options={}, content=[]):
         url = f"https://hub.docker.com/r/llamastack/{text}"

docs/source/contributing/index.md

@@ -2,14 +2,28 @@
 ```{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.
+## Testing
 
+See the [Test Page](testing.md) which describes how to test your changes.
+```{toctree}
+:maxdepth: 1
+:hidden:
+:caption: Testing
 
+testing
+```
 
+## Adding a New Provider
+
+See the [Adding a New API Provider Page](new_api_provider.md) which describes how to add new API providers to the Stack.
+
+See the [Vector Database Page](new_vector_database.md) which describes how to add a new vector databases with Llama Stack.
+
+See the [External Provider Page](../providers/external/index.md) which describes how to add external providers to the Stack.
 ```{toctree}
 :maxdepth: 1
 :hidden:
 
 new_api_provider
-testing
+new_vector_database
 ```

docs/source/contributing/new_vector_database.md

@@ -0,0 +1,75 @@
+# Adding a New Vector Database
+
+This guide will walk you through the process of adding a new vector database to Llama Stack.
+
+> **_NOTE:_** Here's an example Pull Request of the [Milvus Vector Database Provider](https://github.com/meta-llama/llama-stack/pull/1467).
+
+Vector Database providers are used to store and retrieve vector embeddings. Vector databases are not limited to vector
+search but can support keyword and hybrid search. Additionally, vector database can also support operations like
+filtering, sorting, and aggregating vectors.
+
+## Steps to Add a New Vector Database Provider
+1. **Choose the Database Type**: Determine if your vector database is a remote service, inline, or both.
+   - Remote databases make requests to external services, while inline databases execute locally. Some providers support both.
+2. **Implement the Provider**: Create a new provider class that inherits from `VectorDatabaseProvider` and implements the required methods.
+   - Implement methods for vector storage, retrieval, search, and any additional features your database supports.
+     - You will need to implement the following methods for `YourVectorIndex`:
+        - `YourVectorIndex.create()`
+        - `YourVectorIndex.initialize()`
+        - `YourVectorIndex.add_chunks()`
+        - `YourVectorIndex.delete_chunk()`
+        - `YourVectorIndex.query_vector()`
+        - `YourVectorIndex.query_keyword()`
+        - `YourVectorIndex.query_hybrid()`
+     - You will need to implement the following methods for `YourVectorIOAdapter`:
+        - `YourVectorIOAdapter.initialize()`
+        - `YourVectorIOAdapter.shutdown()`
+        - `YourVectorIOAdapter.list_vector_dbs()`
+        - `YourVectorIOAdapter.register_vector_db()`
+        - `YourVectorIOAdapter.unregister_vector_db()`
+        - `YourVectorIOAdapter.insert_chunks()`
+        - `YourVectorIOAdapter.query_chunks()`
+        - `YourVectorIOAdapter.delete_chunks()`
+3. **Add to Registry**: Register your provider in the appropriate registry file.
+   - Update {repopath}`llama_stack/providers/registry/vector_io.py` to include your new provider.
+```python
+from llama_stack.providers.registry.specs import InlineProviderSpec
+from llama_stack.providers.registry.api import Api
+
+InlineProviderSpec(
+    api=Api.vector_io,
+    provider_type="inline::milvus",
+    pip_packages=["pymilvus>=2.4.10"],
+    module="llama_stack.providers.inline.vector_io.milvus",
+    config_class="llama_stack.providers.inline.vector_io.milvus.MilvusVectorIOConfig",
+    api_dependencies=[Api.inference],
+    optional_api_dependencies=[Api.files],
+    description="",
+),
+```
+4. **Add Tests**: Create unit tests and integration tests for your provider in the `tests/` directory.
+   - Unit Tests
+     - By following the structure of the class methods, you will be able to easily run unit and integration tests for your database.
+       1. You have to configure the tests for your provide in `/tests/unit/providers/vector_io/conftest.py`.
+       2. Update the `vector_provider` fixture to include your provider if they are an inline provider.
+       3. Create a `your_vectorprovider_index` fixture that initializes your vector index.
+       4. Create a `your_vectorprovider_adapter` fixture that initializes your vector adapter.
+       5. Add your provider to the `vector_io_providers` fixture dictionary.
+         - Please follow the naming convention of `your_vectorprovider_index` and `your_vectorprovider_adapter` as the tests require this to execute properly.
+   - Integration Tests
+     - Integration tests are located in {repopath}`tests/integration`. These tests use the python client-SDK APIs (from the `llama_stack_client` package) to test functionality.
+     - The two set of integration tests are:
+       - `tests/integration/vector_io/test_vector_io.py`: This file tests registration, insertion, and retrieval.
+       - `tests/integration/vector_io/test_openai_vector_stores.py`: These tests are for OpenAI-compatible vector stores and test the OpenAI API compatibility.
+        - You will need to update `skip_if_provider_doesnt_support_openai_vector_stores` to include your provider as well as `skip_if_provider_doesnt_support_openai_vector_stores_search` to test the appropriate search functionality.
+     - Running the tests in the GitHub CI
+       - You will need to update the `.github/workflows/integration-vector-io-tests.yml` file to include your provider.
+        - If your provider is a remote provider, you will also have to add a container to spin up and run it in the action.
+   - Updating the pyproject.yml
+     - If you are adding tests for the `inline` provider you will have to update the `unit` group.
+       - `uv add new_pip_package --group unit`
+     - If you are adding tests for the `remote` provider you will have to update the `test` group, which is used in the GitHub CI for integration tests.
+       - `uv add new_pip_package --group test`
+5. **Update Documentation**: Please update the documentation for end users
+   - Generate the provider documentation by running {repopath}`./scripts/provider_codegen.py`.
+   - Update the autogenerated content in the registry/vector_io.py file with information about your provider. Please see other providers for examples.

docs/source/contributing/testing.md

@@ -1,6 +1,8 @@
-# Testing Llama Stack
+```{include} ../../../tests/README.md
+```
 
-Tests are of three different kinds:
-- Unit tests
-- Provider focused integration tests
-- Client SDK tests
+```{include} ../../../tests/unit/README.md
+```
+
+```{include} ../../../tests/integration/README.md
+```