Update the index page

Author: anbuzin

docs/ai/index.rst

@@ -1,13 +1,27 @@
 .. _ref_ai_overview:
 
-==
-AI
-==
+======
+Gel AI
+======
 
-:edb-alt-title: Using EdgeDB AI
+:edb-alt-title: Using Gel AI
+
+Gel AI is a set of tools designed to enable you to ship AI-enabled apps with
+practically no effort. This is what comes in the box:
+
+1. ``ext::ai``: this Gel extension automatically generates embeddings for your
+   data. Works with OpenAI, Mistral AI, Anthropic, and any other provider with a
+   compatible API.
+
+2. ``ext::vectorstore``: this extension is designed to replicate workflows that
+   might be familiar to you from vectorstore-style databases. Powered by
+   ``pgvector``, it allows you to store and search for embedding vectors, and
+   integrates with popular AI frameworks.
+
+3. Python library: ``gel.ai``. Access all Gel AI features straight from your
+   Python application.
+
+4. JavaScript library: ``gel.ai``.
 
-EdgeDB AI allows you to ship AI-enabled apps with practically no effort. It
-automatically generates embeddings for your data. Works with OpenAI, Mistral
-AI, Anthropic, and any other provider with a compatible API.