refactor: remove /dashboard prefix and change /users/ to /u/

This overhaul automatically redirects old routes to new routes
they served no purpose anyway and were link noise.
i don't like them

github-bot/src/main.ts

@@ -47,7 +47,7 @@ function mkSeedDiffViewMsg(repo: string, sha: string, compareRepo: string, compa
 
 *****
 
-[View Seeds Diff](https://bokutachi.xyz/dashboard/utils/seeds?${params.toString()}
+[View Seeds Diff](https://bokutachi.xyz/utils/seeds?${params.toString()}
 `;
 }