Markdown issues

[RobbinBaauw]

Sometimes when using markdown, it doesn't render properly.

Most of the times this is fixable by re-entering with proper line breaks, but this shouldn't be necessary.

[RobbinBaauw]

This https://github.com/nhn/tui.editor looks awesome, it has a lot of functionality:

• A viewer (so no crappy rendering on the server anymore), which is light
• UML / charting / codeblock support
• Integrated markdown / WYSIWYG switching
• Nice tables
• Easy to write extensions

The only thing it doesn't have great support for, is anything concerning realtime editing (which was a big + of quill). This library gives markdown output, we could wrap that output in a quill container and sync everything. Big negative of this is that all content needs to be refreshed upon any character change (so we need to really think about it)

[RobbinBaauw]

Closing in favor of #190