docs: Reorganize the Base App section

docs/base-app/agents/best-practices.mdx

@@ -0,0 +1,19 @@
+---
+title: 'Chat Agent Best Practices'
+description: 'Guidelines and recommendations for building effective chat agents'
+sidebarTitle: 'Best Practices'
+---
+
+### Best practices
+
+1. Always validate content structures
+2. Provide fallbacks for unsupported clients
+3. Test across client versions
+4. Limit message and metadata size
+5. Follow [XIP-67](https://community.xmtp.org/t/xip-67-inline-actions/941)
+6. Your agent should respond to both direct messages and group chat messages (if applicable).
+7. For direct messages, it should automatically respond.
+8. We recommend reacting to messages with an emoji (like 👀or ⌛) to indicate the message was received, while the response is processing.
+9. For group chat messages, agents should only respond if they are mentioned with the "@" symbol and the agent's name. (example "@bankr"), OR if the user replies directly to a message from the agent (using the reply content type).
+
+For group chat messages, agents should only respond if they are mentioned with the "@" symbol and the agent's name. (example "@bankr"), OR if the user replies directly to a message from the agent (using the reply content type).