[docs] Publish changelog to gh-pages

- Format ChangeLog in Markdown.
- Publish ChangeLog as part of the mkdocs documentation to gh-pages.
- Fix formatting of sub lists on docs index page.

docs/changelog.md

@@ -0,0 +1 @@
+--8<-- "ChangeLog"

mkdocs.yml

@@ -46,18 +46,27 @@ theme:
 #    - navigation.indexes
     - navigation.top
   palette:
-    - scheme: default
+    # Palette toggle for automatic mode
+    - media: "(prefers-color-scheme)"
+      toggle:
+        icon: material/brightness-auto
+        name: Switch to light mode
+    # Palette toggle for light mode
+    - media: "(prefers-color-scheme: light)"
+      scheme: default
       primary: white
       accent: teal
       toggle:
-        icon: material/toggle-switch
+        icon: material/brightness-7
         name: Switch to dark mode
-    - scheme: slate
+    # Palette toggle for dark mode
-      primary: blue grey
+    - media: "(prefers-color-scheme: dark)"
+      scheme: slate
+      primary: black
       accent: teal
       toggle:
-        icon: material/toggle-switch-off-outline
+        icon: material/brightness-4
-        name: Switch to light mode
+        name: Switch to system preference
   font:
     text: Roboto
     code: Roboto Mono
@@ -112,6 +121,9 @@ markdown_extensions:
       repo: mkdocs-material
   - pymdownx.mark
   - pymdownx.smartsymbols
+  - pymdownx.snippets:
+      base_path: [!relative $config_dir]
+      check_paths: true
   - pymdownx.superfences:
       custom_fences:
         - name: mermaid
@@ -159,4 +171,5 @@ nav:
       - Remote Access: advanced/remote-access.md
       - Multiple Instances: advanced/multiple-instances.md
     - Development: development.md
+    - Changelog: changelog.md
   - JSON API: json-api.md