Add CI checking for css files

.github/workflows/ci.yaml

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+name: CI
+
+on: [pull_request, push]
+
+jobs:
+  main:
+    runs-on: ubuntu-20.04
+
+    steps:
+    - name: checkout repository
+      uses: actions/checkout@v2
+
+    - name: setup nodejs
+      uses: actions/setup-node@v2
+      with:
+        node-version: '14'
+
+    - name: install tools
+      run: npm install
+
+    - name: lint code
+      run: npm run lint
+
+    - name: format code
+      run: |
+        npm run format
+        git diff --exit-code

.gitignore

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+node_modules
+package-lock.json

.stylelintrc.json

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+{
+  "extends": "stylelint-config-standard",
+  "plugins": [
+    "stylelint-order"
+  ],
+  "rules": {
+    "color-hex-length": null,
+    "comment-empty-line-before": null,
+    "comment-whitespace-inside": null,
+    "declaration-colon-newline-after": null,
+    "function-name-case": null,
+    "length-zero-no-unit": null,
+    "no-descending-specificity": null,
+    "value-keyword-case": null,
+    "order/properties-alphabetical-order": true
+  }
+}

package.json

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+{
+  "name": "qBittorrent-website",
+  "description": "qBittorrent website",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/qbittorrent/qBittorrent-website.git"
+  },
+  "scripts": {
+    "format": "prettier --write **.css",
+    "lint": "stylelint **/*.css"
+  },
+  "devDependencies": {
+    "prettier": "*",
+    "stylelint": "*",
+    "stylelint-config-standard": "*",
+    "stylelint-order": "*"
+  }
+}