Update deployment workflow to copy posts correctly

Author: ph-value

.github/workflows/deploy.yml

@@ -27,8 +27,8 @@ jobs:
 
       - name: Copy posts to build/web/assets
         run: |
-          mkdir -p build/web/assets
-          cp -r post build/web/assets/
+          mkdir -p build/web/post
+          cp -a post/. build/web/post/
 
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3