Add ability for additional items under certain fields

[loganmeetsworld]

Currently "other contacts", organization website, and alternative domains have no mechanism to add more than one. We'd like to be able to allow users to add additional of these items in the form.

[SSPJ]

Going to start the JavaScript work for this. The Django work may need to be its own ticket.

[calerubensteingsa]

12/20:

Ran into blocker where library doesn't allow multiple forms to one page - needs to be separate form objects

[calerubensteingsa]

12/22:

• Possible merge conflicts to work out with changes to form library

[calerubensteingsa]

1/17:

• Review feedback

[loganmeetsworld]

#365