Fix malformed table format in GitHub Pages

Add explicit 'tables' extension to mkdocs markdown_extensions to ensure
proper table rendering when using pymdownx.snippets to include README.md.

Fixes #115

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jerry-git

mkdocs.yml

@@ -19,6 +19,7 @@ nav:
   - changelog.md
 
 markdown_extensions:
+  - tables
   - pymdownx.snippets:
       check_paths: true