Replace outdated spanX classes
Goodbye wells

Since there's no sidepanel any more, wells aren't necessary
Move request description from view to model
Landing page improvements

Because the new request dropdown doesn't work without JS, it should be hidden
when JS is disabled. To further support the non-JS case, the landing page
displays the list of possible requests.
Add missing full stop in the form copy
Update error alert classes
Append app name to each page title
Add feedex link to landing page
Bump govuk_admin_template version to get footer fix
Require jquery.ui.datepicker styles earlier