Major overhaul:

- transition to `pyproject.toml` config
- include license (Apache-2.0)
- add dev tools
- add documentation config (`mkdocs` based)
- turn `README.md` into a symlink to docs `index.md`
- add convenience scripts for testing and linting

mkdocs.yaml

@@ -0,0 +1,38 @@
+copyright: "© 2023 ${REPO_OWNER_TITLE}"
+site_name: "${REPO_NAME}"
+site_description: "${REPO_DESCRIPTION}"
+site_url: "http://${REPO_OWNER_LOWER}.github.io/${REPO_NAME_LOWER}"
+repo_name: "${REPO_OWNER_LOWER}/${REPO_NAME_LOWER}"
+repo_url: "https://github.com/${REPO_OWNER_LOWER}/${REPO_NAME_LOWER}"
+
+theme:
+  language: en
+  name: material
+  palette:
+  - media: "(prefers-color-scheme: light)"
+    scheme: default
+    accent: red
+    toggle:
+      icon: material/brightness-7
+      name: Switch to dark mode
+  - media: "(prefers-color-scheme: dark)"
+    scheme: slate
+    accent: red
+    toggle:
+      icon: material/brightness-4
+      name: Switch to light mode
+extra_css:
+  - css/extra.css
+
+plugins:
+  - search
+  - mkdocstrings
+
+markdown_extensions:
+  - admonition
+  - codehilite
+  - extra
+  - pymdownx.superfences
+
+nav:
+  - Home: index.md