docs: add Sphinx documentation build and deploy workflow

- Add Gitea Actions workflow to build and deploy docs on push to main
- Generate Sphinx reference documentation for all apps and modules
- Deploy versioned and latest docs via rsync over SSH

pyproject.toml

@@ -53,8 +53,13 @@ lint = [
     "ruff>=0.6,<1.0",
 ]
 docs = [
-    "mkdocs>=1.6,<2.0",
-    "mkdocs-material>=9.5,<10.0",
+    "sphinx>=8.0,<10.0",
+    "sphinx-rtd-theme>=3.0,<4.0",
+    "sphinx-autodoc-typehints>=2.0,<4.0",
+    "sphinx-autobuild>=2024.0,<2026.0",
+    "sphinxcontrib-httpdomain>=1.8,<2.0",
+    "sphinxcontrib-mermaid>=1.0,<2.0",
+    "myst-parser>=4.0,<5.0",
 ]
 
 [build-system]