➕ add missing stylelint dependencies

Signed-off-by: Vinicius Reis <vinicius.reis@nextcloud.com>

package.json

@@ -135,10 +135,15 @@
 		"lowlight": "^1.20.0",
 		"mitt": "^3.0.0",
 		"node-polyfill-webpack-plugin": "^1.1.4",
+		"postcss": "^8.4.14",
+		"postcss-html": "^1.4.1",
 		"regenerator-runtime": "^0.13.9",
 		"sass": "^1.51.0",
 		"sass-loader": "^12.6.0",
 		"style-loader": "^3.3.1",
+		"stylelint": "^14.9.1",
+		"stylelint-config-recommended-scss": "^6.0.0",
+		"stylelint-config-recommended-vue": "^1.4.0",
 		"vite": "^2.9.9",
 		"vite-plugin-commonjs": "^0.5.0",
 		"vite-plugin-vue2": "^2.0.0",