Update lint-staged file types for prettier (#933)

Author: mdroidian

package.json

@@ -34,7 +34,7 @@
     "tailwindConfig": "./packages/tailwind-config/tailwind.config.ts"
   },
   "lint-staged": {
-    "*.{ts|tsx|md}": "prettier -w"
+    "*.{ts,tsx,md,mdx}": "prettier -w"
   },
   "dependencies": {
     "posthog-js": "catalog:"