[ticket/12832] Make .small-icon styling uniform

PHPBB3-12832
[ticket/12832] Add footer links to quick-links

PHPBB3-12832
[ticket/12832] Remove unnecessary attr and classes

PHPBB3-12832
[ticket/12832] Remove old .quick-links icon reference

PHPBB3-12832
Merge remote-tracking branch 'PayBas/ticket/12832' into develop-ascraeus

* PayBas/ticket/12832:
  [ticket/12832] Remove old .quick-links icon reference
  [ticket/12832] Remove unnecessary attr and classes
  [ticket/12832] Add footer links to quick-links
  [ticket/12832] Make .small-icon styling uniform