docs: add mkdocs

.github/workflows/mkdocs.yml

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+name: mkdocs
+on:
+  push:
+    branches:
+      - master
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.x
+      - run: pip install mkdocs-material
+      - run: mkdocs gh-deploy --force

docs/index.md

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+# Welcome
+
+In progress...

mkdocs.yml

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+site_name: Joint Teapot
+repo_url: https://github.com/BoYanZh/joint-teapot
+repo_name: BoYanZh/joint-teapot
+theme:
+  name: material