Add convex knowledge as a link to knowledge file

Author: jahooma

starter-templates/convex/knowledge.md

@@ -4,6 +4,10 @@ Generated by [Codebuff](https://www.npmjs.com/package/codebuff)
 
 Add any information here or instructions that will help Codebuff maintain your project.
 
+## Convex knowledge
+
+https://raw.githubusercontent.com/CodebuffAI/codebuff-community/refs/heads/main/knowledge/convex.knowledge.md
+
 ## Verifying changes
 
 After every change, run `npm run typecheck` to check for any errors that should be fixed.