chore: remove git add from lint-staged tasks

https://github.com/okonet/lint-staged#v10
> From v10.0.0 onwards any new modifications to originally staged files will be automatically added to the commit. If your task previously contained a git add step, please remove this. The automatic behaviour ensures there are less race-conditions, since trying to run multiple git operations at the same time usually results in an error.

package.json

@@ -108,12 +108,10 @@
   },
   "lint-staged": {
     "**/*.{scss,css,html,js,json,md,ts,tsx}": [
-      "prettier --write",
-      "git add"
+      "prettier --write"
     ],
     "**/*.{js,ts,tsx}": [
-      "eslint --fix",
-      "git add"
+      "eslint --fix"
     ]
   },
   "repository": {