Trello onboarding

[pedroCollogno]

Context

We currently require users to pass in their Trello API creds and board link through the init_connections.py script. This presents 2 problems:

• It's ugly
• It's not asking for enough inputs: for instance, we have no guarantee that the names of the Users columns (aka "Lists") will match the ones we expect, or that they have the proper labels for our bots
  Let's try to alleviate those issues

DoD

• The "onboard" script is a little more explanatory about HOW to get the API credentials

• Once credentials are valid, we ask the user to confirm the names of the Trello Lists they use for their process. We can either impose ours (lazy) or save theirs (better, because then we can reference them by id instead of names, which can be edited any time)

• We then ask them to create mock tickets with labels for their automated interns, and save those as well