Update deploy.yml

Author: cabbetlong

.github/workflows/deploy.yml

@@ -49,7 +49,9 @@ jobs:
         id: pages
         uses: actions/configure-pages@v5
       - name: Install Node.js dependencies
-        run: "[[ -f package-lock.json || -f npm-shrinkwrap.json ]] && npm ci || true"
+        run: |
+          "[[ -f package-lock.json || -f npm-shrinkwrap.json ]] && npm ci || true"
+          npm i -D postcss postcss-cli autoprefixer
       - name: Build with Hugo
         env:
           HUGO_CACHEDIR: ${{ runner.temp }}/hugo_cache