fix(ci): change 'changeset' script from 'changeset add' to 'changeset' (#37)

The root package.json had 'changeset': 'changeset add', which caused
'pnpm changeset version' (run by the changesets action) to expand to
'changeset add version' — failing with 'Too many arguments'. This prevented
version PRs from being created, causing the 'No commits between main and
changeset-release/main' error.

Also deleted the stale changeset-release/main branch.

Author: sepehr-safari

package.json

@@ -16,7 +16,7 @@
     "typecheck": "turbo run typecheck",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
-    "changeset": "changeset add",
+    "changeset": "changeset",
     "clean": "turbo run clean && rm -rf node_modules"
   },
   "devDependencies": {