Fix: Remove warning when running lint staged pre-commit hook

Running `git add` is obsolete with the lint-staged version in use.

package.json

@@ -121,8 +121,7 @@
   },
   "lint-staged": {
     "*.{js,json}": [
-      "prettier --write",
-      "git add"
+      "prettier --write"
     ]
   }
 }