Fix Material Design icon rendering in documentation

- Add pymdownx.emoji extension to MkDocs configuration
- Configure emoji_index and emoji_generator for Material theme icons
- Resolves icons showing as text like ':material-rocket-launch:{ .lg .middle }'
- Icons will now render properly as SVG Material Design icons
- Improves visual presentation of documentation

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dmealing

docs/src/site/documentation/mkdocs.yml

@@ -53,6 +53,9 @@ markdown_extensions:
           format: !!python/name:pymdownx.superfences.fence_code_format
   - pymdownx.tabbed:
       alternate_style: true
+  - pymdownx.emoji:
+      emoji_index: !!python/name:material.extensions.emoji.twemoji
+      emoji_generator: !!python/name:material.extensions.emoji.to_svg
   - admonition
   - pymdownx.details
   - attr_list