reword database cli prompts for clarity

[cball]

From a blog where someone was setting up a new project:

[mtliendo]

blog post link: https://lelon.io/blog/getting-started-with-bison

[mtliendo]

Thoughts on enhancing the DX by having the second question ask if they have a db setup?

If yes, proceed with the following questions. If no, walk them through steps similar to yarn db:setup?

[cball]

@mtliendo I missed your comment here, sorry! I think that's a good plan. Right now we also assume postgres, so we may want to pave the way for updating that in the future.

Maybe the flow could be:

• What type of database would you like to use? (multiple choice, postgres only for now)
• Do you have it setup already? (y/n)
• if yes, ask above questions but reword for clarity
• if no, guide them through it? (brew install postgres && createuser postgres --superuser)

If the last step is too much to deal with, we could always link them to a markdown file in the repo.

Totally open to suggestions!

[deloristhompson]

This issue links to PR123