Set up a documentation tool

- use sphinx to document the developed package
- create nox session "docs" to build the docs

docs/conf.py

@@ -0,0 +1,15 @@
+"""Configure sphinx."""
+
+import lalib
+
+
+project = lalib.__pkg_name__
+author = lalib.__author__
+project_copyright = f"2024, {author}"
+version = release = lalib.__version__
+
+extensions = [
+    "sphinx.ext.autodoc",
+    "sphinx.ext.napoleon",
+    "sphinx_autodoc_typehints",
+]