Migrate ideas to GitHub discussions

Author: ChristianMurphy

README.md

@@ -4,3 +4,5 @@ Share ideas for new utilities and tools built with **redot** by
 [creating a new issue](https://github.com/redotjs/ideas/issues/new)
 or find ideas to hack on by browsing
 [open ideas](https://github.com/redotjs/ideas/issues).
+
+> :bulb: now part of https://github.com/redotjs/redot/discussions/categories/ideas