Set up prettier and tailwind even harder

JS tooling breaks at the slightest whiff of nonstandard setups. God
forbid you set up your js project in a subdirectory of the repository
instead of in the root...

meta/fmt-check

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-prettier . --check
+pnpm prettier . --check
 cargo fmt --check