feat: T5DE's website: landing page, download, changelog and FAQ

Co-Authored-By: Claude Opus 5.5 <[email protected]>

README.md

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+# t5de-site
+
+T5DE's website, [t5de.dev](https://t5de.dev): what T5DE is, the download (the latest release of
+[t5de](https://git.t5de.dev/t5de/t5de), with its checksum), the changelog and a FAQ. Releases come from git.t5de.dev's
+API and are refreshed every 5 minutes. The account side is the hub (`t5de-hub`, hub.t5de.dev); this site shares its
+look (Next.js 16, Tailwind 4, shadcn/ui).
+
+    bun install
+    bun run dev          # http://localhost:4200
+
+`bun run check-types`, `bun run build`. The image (`Dockerfile`) serves on port 4200; CI pushes it to
+git.t5de.dev/t5de/t5de-site and Komodo deploys it: main to staging, release tags to t5de.dev.