fix: replace netlify deployment with GitHub Pages preview

Author: varsha-0007

.github/workflows/preview.yml

@@ -8,6 +8,9 @@ jobs:
   deploy-preview:
     name: Build and Deploy Preview
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
 
     steps:
       - name: Checkout code
@@ -16,33 +19,35 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24'
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install Node.js dependencies
+        run: npm ci
+
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v3
         with:
-          hugo-version: 'latest'
+          hugo-version: '0.158.0'
           extended: true
 
-      - name: Install Node.js dependencies
-        run: |
-          if [ -f package.json ]; then
-            npm ci
-          fi
-
       - name: Build Hugo site
-        run: hugo --minify --baseURL "/"
+        run: hugo --minify --baseURL "/academy-theme/pr-preview/pr-${{ github.event.number }}/"
 
-      - name: Deploy Preview to Netlify
-        uses: nwtgck/actions-netlify@v3
+      - name: Deploy Preview to GitHub Pages
+        uses: rossjrw/pr-preview-action@v1
         with:
-          publish-dir: './public'
-          production-deploy: false
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          deploy-message: "Deploy preview for PR #${{ github.event.number }}"
-          alias: deploy-preview-${{ github.event.number }}
-          enable-pull-request-comment: true
-          enable-commit-comment: false
-          overwrites-pull-request-comment: true
+          source-dir: ./public
+          preview-branch: gh-pages
+          umbrella-dir: pr-preview
+          action: auto
         env:
-          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
-          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
-        timeout-minutes: 10
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}