Improve html theme: dark mode, nicer color scheme, icons for github/license, etc.

mkdocs.yml

@@ -1,17 +1,44 @@
 site_name: OpenBLAS
 site_url: https://openblas.net/docs/
+repo_url: https://github.com/OpenMathLib/OpenBLAS
+copyright: Copyright © 2012- OpenBLAS contributors
+
 theme:
   name: material
   logo: logo.svg
   favicon: logo.svg
+  features:
+    - header.autohide
   palette:
-    primary: grey
+    # Palette toggle for dark mode
+    - scheme: slate
+      primary: blue grey
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode
+
+    # Palette toggle for light mode
+    - scheme: default
+      primary: blue grey
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+
+plugins:
+  - search
+  - git-revision-date-localized:
+      enable_creation_date: true
+
 markdown_extensions:
   - admonition
   - pymdownx.details
   - pymdownx.superfences
+  - footnotes
+  - pymdownx.tabbed:
+      alternate_style: true
   - toc:
       toc_depth: 4
+
 nav:
   - index.md
   - install.md
@@ -23,3 +50,10 @@ nav:
   - ci.md
   - about.md
   - faq.md
+
+extra:
+  social:
+    - icon: fontawesome/brands/github
+      link: https://github.com/OpenMathLib/OpenBLAS
+    - icon: material/license
+      link: https://github.com/OpenMathLib/OpenBLAS/LICENSE