* refactor(mermaid): enhance Mermaid JS loading logic for flexibility
- Updated the Mermaid JS loader to support configurable remote or local asset loading based on site parameters.
- Improved error handling for asset retrieval and added comments for clarity on behavior based on different configurations.
- Ensured that the default behavior falls back to a CDN if no base is provided, enhancing usability and maintainability.
* chore: clean up comments
* fix: comment typo
