docs: New multi turn chat template (#6976)

Co-authored-by: caitlinwheeless <caitlin@humansignal.com>
Co-authored-by: caitlinwheeless <caitlinwheeless@users.noreply.github.com>

Author: caitlinwheeless

docs/source/templates/gallery_llm_evals.ejs

@@ -41,4 +41,10 @@ cards:
   - Retrieval-Augmented Generation
   image: "/images/templates/evaluate-rag-automated-metrics.png"
   url: "/templates/llm_ragas.html"
+
+- title: Multi-Turn Chat Evaluation
+  categories:
+  - Response Evaluation
+  image: "/images/templates/multi-turn-chat.png"
+  url: "/templates/multi_turn_chat.html"
 ---