[Feature Request] Markdown support #76

It would be quite useful if details section would support markdown.

Additionally (and this might perhaps be a separate feature request), support for Github-style markdown checkboxes [ ] and [x]`. Tasks Android app which syncs via DAVdroid support this and uses them to mark progress (0 - 100% based on percentage of toggled checkboxes). Progress already syncs back to Nextcloud Tasks app, but being able to manage these in the webapp would be really useful!

markdown-it might be the way to go. nextcloud/deck uses it and it also has a checkbox plugin.