add dart sass installation step

Author: yfxu

.github/workflows/gh-pages.yml

@@ -8,15 +8,18 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true  # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
 
+      - name: Install Dart-Sass
+        run: sudo snap install dart-sass-embedded
+
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
         with: