title: how to point url to a different directory
body: <p>please kindly assist, am quite stuck here.
  i am working a web app that require users to register and have individual directory on my site.
  i want the users directory to be like: 
  <a href="http://example.com/theusername" rel="nofollow">http://example.com/theusername</a></p>
  
  <p>this i could make work by creating folders on my site root for each user. but that will keep my root directory over clustered.
  is it possible for me to make the user directory to be: <a href="http://example.com/u/theusername" rel="nofollow">http://example.com/u/theusername</a> but have but assess it via <a href="http://example.com/theusername" rel="nofollow">http://example.com/theusername</a> ??</p>
  
  <p>thank you.</p>