remove db:setup & seed_fu from install docs. gitlab:setup does it

doc/install/installation.md

@@ -196,8 +196,6 @@ Make sure to update username/password in config/database.yml.
 ## Initialise Database and Activate Advanced Features
-    sudo -u git -H bundle exec rake db:setup RAILS_ENV=production
-    sudo -u git -H bundle exec rake db:seed_fu RAILS_ENV=production
     sudo -u git -H bundle exec rake gitlab:setup RAILS_ENV=production