docs(user-stories): add 116 stories from the Hermes Discord archive (#23436)

* docs(user-stories): add 116 stories from Discord archive

Mined teknium1/nous-discord-archive for first-person user stories that match
the existing collage voice ('I run X every day', 'my family uses Hermes for
Y', 'so I built Z'). Skipped pure project pitches, Q&A, install help, and
generic announcements.

- Added 'discord' as a source in UserStoriesCollage (label + brand color)
- Added 116 entries to userStories.json (237 total, up from 121)
- Each entry links back to the discord-archive thread or channel archive file

* docs(user-stories): interleave discord stories across the full collage

Shuffle userStories.json with a fixed seed so the 116 Discord-sourced
entries are mixed evenly with the existing 121 entries instead of
appearing as a contiguous block at the end. Even distribution: 10-16
discord entries per decile across the array (ideal would be ~11).

website/src/components/UserStoriesCollage/index.tsx

@@ -125,6 +125,7 @@ const SOURCE_LABELS: Record<string, string> = {
   linkedin: 'LinkedIn',
   gist: 'GitHub Gist',
   producthunt: 'Product Hunt',
+  discord: 'Discord',
 };
 
 function sourceColor(source: string): string {
@@ -139,6 +140,7 @@ function sourceColor(source: string): string {
     case 'linkedin': return '#0a66c2';
     case 'gist': return '#8b949e';
     case 'producthunt': return '#da552f';
+    case 'discord': return '#5865f2';
     default: return '#64748b';
   }
 }