docs: remove aerospike vector store (#32726)

Thank you for contributing to LangChain! Follow these steps to mark your
pull request as ready for review. **If any of these steps are not
completed, your PR will not be considered for review.**

- **Description:** Aerospike Vector Store has been retired. It is no
longer supported so It should no longer be documented on the Langchain
site.

- **Add tests and docs**: Removes docs for retired Aerospike vector
store.

- **Lint and test**: NA

libs/packages.yml

@@ -671,11 +671,6 @@ packages:
   provider_page: gel
   downloads: 194
   downloads_updated_at: '2025-08-10T21:38:36.795416+00:00'
-- name: langchain-aerospike
-  path: .
-  repo: aerospike/langchain-aerospike
-  downloads: 77
-  downloads_updated_at: '2025-08-10T21:38:36.795416+00:00'
 - name: langchain-brightdata
   path: .
   repo: luminati-io/langchain-brightdata