Update template index w/ Timescale (langchain-ai#12729)

templates/docs/INDEX.md

@@ -21,6 +21,7 @@ These templates cover advanced retrieval techniques.
 - [Anthropic Iterative Search](../anthropic-iterative-search): This retrieval technique uses iterative prompting to determine what to retrieve and whether the retriever documents are good enough.
 - [Neo4j Parent Document Retrieval](../neo4j-parent): This retrieval technique stores embeddings for smaller chunks, but then returns larger chunks to pass to the model for generation.
 - [Semi-Structured RAG](../rag-semi-structured): The template shows how to do retrieval over semi-structured data (e.g. data that involves both text and tables).
+- [Temporal RAG](../rag-timescale-hybrid-search-time): The template shows how to do retrieval over data that has a strong time-based component.
 
 ## 🔍Advanced Retrieval - Query Transformation
 
@@ -41,7 +42,6 @@ A selection of advanced retrieval methods that involve constructing a query in a
 - [Neo4j Cypher Generation](../neo4j-cypher): Generate cypher statements from natural language. Available with a ["full text" option](../neo4j-cypher-ft) as well.
 - [Supabase Self Query](../self-query-supabase): Parse a natural language query into a semantic query as well as a metadata filter for Supabase.
 
-
 ## 🦙 OSS Models
 
 These templates use OSS models.