Add subdomain-based portfolio preview URLs (<github-username>.foliox.site)

[sumukhj1219]

1. DNS Configuration
   *.foliox.site → CNAME → cname.vercel-dns.com

2. Add wildcard domain in Vercel dashboard
   *.foliox.site

3. Route requests using Vercel middleware
   middleware.js

So the resulting behaviour would be both
foliox.site/github-username
&
github-username.foliox.site

NOTE : But we need to explicitly exclude or handle www.foliox.site, otherwise the middleware will mistakenly treat www as a username.

[sumukhj1219]

I have added this feature but by default it redirects to /username shall I change it or keep both the features

Screencast.From.2025-11-30.12-42-12.mp4