Add task list support and update roadmap in documentation

- Added pymdownx.tasklist extension to mkdocs.yml for enhanced task management.
- Revised the roadmap section in index.md to include additional completed and in-progress tasks, improving project tracking and visibility.

docs/mkdocs.yml

@@ -81,6 +81,8 @@ markdown_extensions:
   - pymdownx.snippets
   - pymdownx.tabbed:
       alternate_style: true
+  - pymdownx.tasklist:
+      custom_checkbox: true
   - pymdownx.emoji:
       emoji_index: !!python/name:material.extensions.emoji.twemoji
       emoji_generator: !!python/name:material.extensions.emoji.to_svg