docs: README, plan, guides and the site describe what is built now

README: rewritten around what runs (Linux software, Xorg, apk, Linux's drivers), the honest gaps, measured numbers.
plan/: 1.0.md is the finish line, where each clause of the acceptance test stands, and the register (one failing
clause: a root that survives a reboot); built plans (foundations, hybrid, alpine, xorg) and the decided-against one
(wayland) are gone, their content lives in architecture/; roadmap.md is only what is still open.
guides: building/layout/testing/adding-a-driver (Linux code may be used). history: four entries (ls -lR, TLB
shootdowns, MDIO 0x02460246, netlink MSG_TRUNC). Website: cards, stack, download page, docs index.
Code comments that pointed at deleted plan docs point at the architecture docs.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EVRhxi9zpdW2uDUN4FVcao

docs/Website/README.md

@@ -30,7 +30,7 @@ is a token. A hex value in that file means the system is missing something, and
 the answer is to add it to Niveus rather than to work around it here.
 
 What that replaced was a 21 KB `style.css` that transcribed
-[`include/gfx/theme.h`](../../include/theme.h) by hand — palette, type scale,
+[`include/gfx/theme.h`](../../include/gfx/theme.h) by hand — palette, type scale,
 shadows, the lot. The intent was right and the mechanism was a copy: two files
 that had to be kept in step by remembering to. Now the whole identity is one
 declaration, in the `<head>` of each page: