FEATURE: add clean support for running Discourse in a subfolder

To setup set DISCOURSE_RELATIVE_URL_ROOT to the folder you wish

app/controllers/users_controller.rb

@@ -142,7 +142,7 @@ class UsersController < ApplicationController
 
   def my_redirect
     if current_user.present? && params[:path] =~ /^[a-z\-\/]+$/
-      redirect_to "/users/#{current_user.username}/#{params[:path]}"
+      redirect_to path("/users/#{current_user.username}/#{params[:path]}")
       return
     end
     raise Discourse::NotFound.new