Enhanced layout snippet with conditional styling support for dark mode. Updated typography and grid classes for improved text and visual consistency. Added additional memorial section content, including headings and text fields for tributes. Expanded blueprint definitions with new block types (`line`, `gallery`, and `quote`). Adjusted chessboard piece and square dimensions in `pgn4web.css` for refined appearance.
Replaces repetitive header, navbar, and footer code in templates with a centralized `layout` snippet for better maintainability. Cleans up and simplifies various template snippets.
tfeigel