Create walkthrough or tutorials / previews for each module

[mdroidian]

Ideally after

• https://github.com/dvargas92495/roamjs-workbench/issues/402
• https://github.com/dvargas92495/roamjs-workbench/issues/401

  Reason

• better user experience
• less customer support requests
• use as a marketing campaign to attract more users

[dvargas92495]

We should also ideally build some of this into the tutorials module (or just revamp that one from scratch).