"Mijay"

refactor: polish hero copy, nav a11y, projects, repos, and about cards.

- improve the navigation hamburger with keyboard support, proper aria states, and auto-close when resizing to desktop
- simplify the Colibri Creative Web entry by removing its demo button while keeping the repo link
- harden Latest Repos screenshots with layered fallbacks and smoother hover overlays
- rebuild the About writing cards for consistent sizing, shared fallbacks, and the classic blue “Read Now” CTA with tighter spacing
- fix React warnings on About by adding stable keys and removing nested paragraphs