Add github actions for docs verifying

.github/workflows/test-docs.yaml

@@ -0,0 +1,29 @@
+name: Test Docs
+
+on:
+    pull_request: {}
+    push: {}
+
+jobs:
+  deploy:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true # Fetch Hugo themes (true OR recursive)
+          fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@v2
+        with:
+          hugo-version: "0.84.0"
+          extended: true
+
+      - name: Build Docs
+        run: |
+          cd site
+          npm install postcss-cli
+          npm install autoprefixer
+          npm audit fix
+          hugo --minify
+