Replace plain text cards with tombstone background images that swap
from gray to green on hover. Add header navigation with About,
Contribute, and Contact links. Create about page with site description.
Simplify header layout and improve text styling for card names.
Replace the original light theme with a dark green-toned design using
Inter and IBM Plex Mono fonts. Refactor index.html from a sidebar list
to a searchable card grid. Restructure memorial.html with a two-column
grid layout and sticky sidebar. Update footer copyright text to clarify
memorial content belongs to its respective creators and rights holders.
