Merge branch 'lint-staged' into 'main'

Add lint-staged

See merge request soapbox-pub/ditto!229

.hooks/pre-commit

@@ -1,4 +1,4 @@
 #!/usr/bin/env sh
 . "$(dirname -- "$0")/_/hook.sh"
 
-deno fmt --check
+deno run -A npm:lint-staged

.lintstagedrc

@@ -0,0 +1,3 @@
+{
+  "*.{ts,tsx,md}": "deno fmt"
+}