ci: update github action deploy_docs workflow

Author: calebman

.github/workflows/deploy_docs.yml

@@ -23,4 +23,14 @@ jobs:
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: docs/.vuepress/dist/vuepress-plugin-demo-container/
+          publish_dir: docs/.vuepress/dist/vuepress-plugin-demo-container/
+
+      - name: Deploy to server
+        uses: easingthemes/ssh-deploy@v2.1.1
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.SERVER_SSH_KEY }}
+          ARGS: "-rltgoDzvO --delete"
+          SOURCE: "docs/.vuepress/dist/vuepress-plugin-demo-container/"
+          REMOTE_HOST: ${{ secrets.REMOTE_HOST }}
+          REMOTE_USER: ${{ secrets.REMOTE_USER }}
+          TARGET: ${{ secrets.REMOTE_TARGET }}