Docxygen (#187)

### What problem were solved in this pull request?

使用doxygen生成代码文档

Problem:
doxygen可以很方便的把代码注释转换成文档，但是当前没有利用这个功能

### What is changed and how it works?
增加了doxyfile，并在github action的workflow中增加了这个功能

### Other information

.github/workflows/jekyll-gh-pages.yml

@@ -30,13 +30,21 @@ jobs:
         uses: actions/checkout@v3
         with:
           submodules: false
+
+      - name: Doxygen Action
+        run: mattnotmitt/doxygen-action@v1.9.5
+        working-directory: .
+        doxyfile-path: ./Doxyfile
+
       - name: Setup Pages
         uses: actions/configure-pages@v3
+
       - name: Build with Jekyll
         uses: actions/jekyll-build-pages@v1
         with:
           source: ./
           destination: ./_site
+
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v1