web: widen registry page to 2000px (use wide-screen dead margins)

Kept byte-identical to the deployed basisvr.github.io/packages/index.html.

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

Author: dooly123

src/BasisPM.Server/wwwroot/index.html

@@ -44,7 +44,7 @@
     <div data-parallax="4" class="absolute bottom-[10%] right-[12%] h-80 w-80 rounded-full bg-purple-500/25 dark:bg-purple-500/15 blur-3xl"></div>
   </div>
 
-  <div class="mx-auto max-w-7xl px-6 py-8 sm:py-12">
+  <div class="mx-auto max-w-[2000px] px-6 py-8 sm:py-12">
 
     <!-- Top bar (shared site chrome — logo + nav are the way back to basisvr.org) -->
     <div class="flex items-center justify-between">