[PD-844] Updated the Company Profile model and form

Missing from this page:

- Company Name
-- Should be read only if imported from content acquisition
- Company Profile
-- Should be read only if imported from content acquisition
- Right Navigation
- Modification:
-- add a link to authorize.net in the help text for the authorize.net account login field. It should open in a new window
-- Remove blocked users list
-- Remove "customer of" section from form (but leave it in the backend for now)