Add frontend CI pipeline for linting HTML, CSS, and JS

.github/workflows/frontend-ci.yml

@@ -0,0 +1,34 @@
+name: Frontend Pipeline
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4   # Step 1: Download your code
+
+      - name: Install Node.js (for linters/tools)
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install HTMLHint
+        run: npm install -g htmlhint
+
+      - name: Run HTML Lint
+        run: htmlhint "**/*.html"
+
+      - name: Install CSS Lint
+        run: npm install -g stylelint
+
+      - name: Install JS Lint (ESLint)
+        run: npm install -g eslint 
+
+      - name: Run JS Lint
+        run: npx eslint "**/*.js"

eslint.config.js

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+export default [
+    {
+        rules: {
+            "no-unused-vars": "warn",
+            "no-undef": "warn",
+        },
+    },
+];