acg-website: remove Paper/Ledger skin, set Bold as default

- CSS: Bold tokens now at :root (bone/near-black palette, signal orange)
- JS: skin switcher cycles Bold/Midnight/Verdigris (default: bold)
- HTML: all 7 pages default to bold skin
- Docs: README + DESIGN.md rewritten for Bold design language
- Deployment: live at ww9.azcomputerguru.com (IX hosting, grey-cloud DNS)

Paper/Sonoran Ledger skin dropped per user direction. Single-page ledger
version in root retained as archived reference pattern.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

projects/acg-website-showcase/multipage/index.html

@@ -15,7 +15,7 @@
     (function () { try {
       var s = localStorage.getItem("acg-theme");
       var m = s || (window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light");
-      document.documentElement.setAttribute("data-theme",m);document.documentElement.setAttribute("data-skin",(localStorage.getItem("acg-skin")||"ledger"));document.documentElement.classList.add("js");
+      document.documentElement.setAttribute("data-theme",m);document.documentElement.setAttribute("data-skin",(localStorage.getItem("acg-skin")||"bold"));document.documentElement.classList.add("js");
     } catch (e) {} })();
   </script>
   <script type="application/ld+json">