feat: Add /skills route to Vercel configuration

- Added /skills rewrite rule to vercel.json
- Enables direct navigation to http://localhost:3000/skills
- Consistent with other component routes (/agents, /commands, etc.)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: davila7

docs/vercel.json

@@ -32,6 +32,10 @@
       "source": "/plugins",
       "destination": "/index.html"
     },
+    {
+      "source": "/skills",
+      "destination": "/index.html"
+    },
     {
       "source": "/plugin/:name",
       "destination": "/plugin.html"