[ticket/11740] Update FAQ to include Ideas Centre

PHPBB3-11740
Merge remote-tracking branch 'unknownbliss/ticket/11740' into prep-release-3.0.12

* unknownbliss/ticket/11740:
  [ticket/11740] Update FAQ to include Ideas Centre
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [ticket/11740] Update FAQ to include Ideas Centre
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11740] Update FAQ to include Ideas Centre