[Hart] FAQ Edit

Progressing
https://github.com/mysociety/FixMyStreet-Commercial/issues/478
[Hart] remove Bromley specific customizations

From code, css, and from unneeded customization of report form

Progresses:
  https://github.com/mysociety/FixMyStreet-Commercial/issues/475
  https://github.com/mysociety/FixMyStreet-Commercial/issues/474