Introduce per-card accent colors to enhance the visual hierarchy of the documentation shortcut cards. This includes adding left borders, colored eyebrows, and matching hover glows using CSS variables.
Additionally, this commit:
- Adds color-coded tags (GET, POST, JSON, etc.) for API links.
- Implements retro-themed styling for both the shortcut cards and tags to maintain consistency with the classic 16-color VGA palette.
- Applies the new accent classes to the API page template.