docs: remove orphaned integrations section and fix tool count (#826)

- Remove docs/docs/integrations/ (orphaned from nav, duplicates MCP section)
- Fix "300+" to "340" tool count in MCP index page

Author: joshrotenberg

docs/docs/integrations/index.md

@@ -32,7 +32,7 @@ With the MCP server, you can:
 
     ---
 
-    300+ tools covering Redis Cloud, Redis Enterprise, and direct database operations.
+    340 tools covering Redis Cloud, Redis Enterprise, and direct database operations.
 
 -   :material-cog:{ .lg .middle } **IDE Integration**