chore: migrate from tailwind to mantine

apps/auth-proxy/package.json

@@ -16,7 +16,6 @@
   "devDependencies": {
     "@acme/eslint-config": "workspace:^0.2.0",
     "@acme/prettier-config": "workspace:^0.1.0",
-    "@acme/tailwind-config": "workspace:^0.1.0",
     "@acme/tsconfig": "workspace:^0.1.0",
     "eslint": "^8.53.0",
     "nitropack": "^2.8.1",
@@ -30,4 +29,4 @@
     ]
   },
   "prettier": "@acme/prettier-config"
-}
+}