docs(site): make docs-site the knowledge base — status tracker + setup guides

Per the new docs workflow (docs-site = KB layer; repo docs/ keeps design notes):
- Add a canonical Status & Progress tracker (status.md): milestones, per-box live
  state, and a dated progress log — the go-forward place to track progress.
- Add setup guides: GNOME/Mutter host (gnome-box — Secure Boot MOK enroll, the
  libnvidia-gl EGL fix, autologin, screen-lock disable, appliance unit), headless
  KDE box, and Bazzite host (ujust input group, gamescope session, gotchas).
- Roadmap is now canonical in docs-site (synced the skew-handshake section 12
  update); removed the repo docs/roadmap.md copy and repointed README to docs-site.
- Nav (meta.json) + landing cards updated; site builds (bun run build).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -27,7 +27,9 @@ per-session virtual output (KWin, gamescope, Mutter, Sway backends), encoded wit
 plane (p50 ~0.8 ms capture→reassembled at 720p120), with a SPAKE2 PIN pairing ceremony. Both
 run from **one process** (`serve --native`), managed through a REST API + web console. Builds
 against FFmpeg 7 or 8; deployed live on Bazzite. Full status: [`CLAUDE.md`](CLAUDE.md);
-roadmap: [`docs/roadmap.md`](docs/roadmap.md).
+roadmap, setup guides & progress: the docs site ([`docs-site/`](docs-site) — Fumadocs;
+`bun run dev`), with the canonical [roadmap](docs-site/content/docs/roadmap.md) and
+[status](docs-site/content/docs/status.md) there. Design notes stay in [`docs/`](docs).
 
 ## Layout