site: simplify nav + add sortable CVE chart
nav: removed Releases / CVEs / Defenders links — kept only a
right-aligned GitHub link with the Octocat SVG icon.
index.html: replaced pill-grid corpus view with a proper sortable
table — Year, CVE, Bug, Module, Tier columns. Click headers to
sort. Defaults to Year descending. 28 rows covering 2016 → 2026.
style.css: added .nav-github (border-pill style) + table styles
(sortable headers with arrow indicators, hover rows, mobile-
responsive font-size + overflow-x scroll).
JS for sort is ~25 lines vanilla — no library.
leviathan
58fb2e0951