feature(pu): add lightzero sphinx docs (#237)

* feature(pu): add lightzero sphinx docs

* feature(pu): add .readthedocs.yaml

* polish(pu): move .readthedocs.yaml to the root directory

* polish(pu): polish sphinx requirements

* polish(pu): polish recommonmark requirements

* fix(pu): fix api_doc and use sphinx_rtd_theme

* fix(pu): fix .readthedocs.yaml

* fix(pu): fix .readthedocs.yaml

* fix(pu): fix .readthedocs.yaml

* fix(pu): fix conf.py

* fix(pu): fix requirements-doc.txt

* fix(pu): fix requirements-doc.txt

* fix(pu): fix requirements-doc.txt

* fix(pu): fix requirements-doc.txt

* polish(pu): delete doc/zh_CN

* polish(pu): polish conf.py

* polish(pu): polish conf.py

* polish(pu): polish deploy.yml for docs

* fix(pu): Update GitHub Actions workflow and add .nojekyll file

* polish(pu): polish deploy.yml for docs

* polish(pu): polish deploy.yml for docs

* polish(pu): polish deploy.yml for docs

* polish(pu): polish deploy.yml for docs

* polish(pu): polish deploy.yml for docs

* polish(pu): polish deploy.yml for docs

* polish(pu): polish documentation

Author: puyuan1996

.github/workflows/deploy.yml

@@ -0,0 +1,38 @@
+name: Deploy Sphinx Docs to GitHub Pages
+
+on:
+  push:
+    branches:
+      - dev-doc
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout the repository
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.11'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install --upgrade -r requirements-doc.txt
+        pip install -e .
+        pip install sphinx sphinx-rtd-theme recommonmark
+
+    - name: Build the Sphinx documentation
+      run: |
+        cd docs/en
+        make html
+        cp ../../.nojekyll ./build/html/.nojekyll
+
+    - name: Deploy to GitHub Pages
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./docs/en/build/html