prompt repeat users to share with friends/colleagues

[vanderhoop]

As a product owner,
I want regular users of RemoteRetro to spread the word,
So that like-minded teams use RemoteRetro.

By Way Of Explanation: at the moment, the only sort of social outreach we extend to visitors are the 'Tweet' and GitHub 'Star' buttons on the landing page. We have a dedicated user base,

Acceptance Criteria [INCOMPLETE]:

• repeat users of RemoteRetro (at least X retros completed) are presented with a modal that reads:
  "RemoteRetro is open-source software, madefreely available to teams who want to improve. If you find value in the software, please help us spread the word to your friends and colleagues:

Helpful Links:

• documentation link

[vanderhoop]

adding 'blocked' until we've settled on means of sharing (email versus social media) and copy