Feature Request: Add a Deploy to Heroku button

[Djiit]

Allow users to easily deploy Cherry on Heroku

[fwuensche]

I'm coming back to this issue. What do you think of, rather than providing a deploy to heroku button, provide a docker image (which we already have) with generic instructions on how to deploy to any provider - such as render, fly, digital ocean.

Ideally, however, we'd also deploy Cherry this way.