docs: set up documentation

.github/workflows/documentation.yml

+name: docs
+on:
+  release:
+    types:
+      - published
+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
+          cd docs
+          mkdocs gh-deploy --force
\ No newline at end of file

docs/docs/index.md

+# PodNotes
+

docs/mkdocs.yml

+site_name: PodNotes
+repo_url: https://github.com/chhoumann/podnotes
+edit_uri: edit/master/docs/docs
+theme:
+  name: material
+  palette:
+    primary: blue
+# markdown_extensions:
+#   - abbr
+#   - admonition
+#   - pymdownx.highlight
+#   - pymdownx.superfences
+#   - pymdownx.tabbed
+#   - pymdownx.tasklist
+# nav:
+#   - Overview: 'index.md'
+# plugins:
+#   - search
+#   - redirects:
+#       redirect_maps:
+