Fixup styles

doc/mkdocs.yml

@@ -2,7 +2,18 @@ site_name: Katenary documentation
 docs_dir: ./docs
 theme:
   name: material
+  custom_dir: overrides
   logo: statics/logo.png
+  palette:
+    - scheme: slate
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode
+
+    - scheme: default
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
 markdown_extensions:
   - admonition
   - attr_list
@@ -17,6 +28,12 @@ extra_css:
   - statics/main.css
 extra_javascript:
   - statics/addons.js
+copyright: Copyright © 2021 - 2022 - Katenary authors
+extra:
+  generator: false
+  social:
+    - icon: fontawesome/brands/github
+      link: https://github.com/metal3d/katenary
 nav:
   - "Home": index.md
   - usage.md