Setting up GitHub Action for CSS and future linting

.github/workflows/linter.yml

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+name: Lint Code Base
+
+on:
+  pull_request:
+    branches: [gh-pages]
+
+jobs:
+  build:
+    name: Lint Code Base
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+        with:
+          # Full git history is needed to get a proper list of changed files within `super-linter`
+          fetch-depth: 0
+
+      - name: Lint Code Base
+        uses: github/super-linter@v4
+        env:
+          VALIDATE_ALL_CODEBASE: false
+          DEFAULT_BRANCH: gh-pages
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+
+          LINTER_RULES_PATH: /
+          CSS_FILE_NAME: .stylelintrc.json
+          VALIDATE_CSS: true

.stylelintrc.json

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+{
+  "rules": {
+    "color-no-invalid-hex": true,
+    "unit-no-unknown": true,
+    "property-no-unknown": true,
+    "declaration-block-no-duplicate-properties": [
+      true,
+      {
+        "ignore": ["consecutive-duplicates-with-different-values"]
+      }
+    ],
+    "declaration-block-no-shorthand-property-overrides": true,
+    "block-no-empty": true,
+    "selector-pseudo-class-no-unknown": true,
+    "selector-pseudo-element-no-unknown": true,
+    "selector-type-no-unknown": true,
+    "comment-no-empty": true,
+    "no-duplicate-selectors": true,
+    "no-extra-semicolons": true
+  }
+}