support HTML content!!! but bundle size up by 60kb

[bodobraegger]

• to undo, simply revert this commit!
• quite a chunky new dependency, with it's newest version not supported by other deps.

Do we need to support raw html?

• If anything needs to be added that is not supported in markdown, this would be the easiest solution.

• Reverting this change should be easy enough, but if content is written in HTML it will have to be removed from the backend manually of course. Releasing to the public would require careful consideration to include HTML parsing support in our interface or not.

I would be glad if someone could weigh in on this decision!

[jimmylevell]

differed until we implemented v1.1. Currently no use case to implement this