Imported RCS doc from old UKFSN site.
Added 'ignore RCS' warning to RCS doc.
Updated RCS formatting to match current site.
Removed hreview from RCS doc.

Have no interest in resurrecting the old extensions at this point.
Merge branch 'feat/rcs_intro' into source

* feat/rcs_intro:
  Removed hreview from RCS doc.
  Updated RCS formatting to match current site.
  Added 'ignore RCS' warning to RCS doc.
  Imported RCS doc from old UKFSN site.