Lists in documents

[joepio]

We can currently show lists using markdown lists in a single element like so:

- I'm an item
- And me too

But this offers a subpar UX, because:

• On enter, we create a regular new element
• On up / down, we skip to another element
• Users need to shift-enter to create a new list item.

This kind of begs the question: how should lists in fact work? Some thoughts:

• We could create a <List> element, similar to paragraph, which has a bunch of <Item>s, each of which contain a markdown string.
• I'd like to have unordered bullet lists, numbered lists, and checkable / todo lists. Maybe it makes sense to treat these todo's as special things, as users may want to link them to a dueDate or assignee, or query them and render them in a bundled todo list.
• Every list item should be able to contain marked up text: bold, italic, links.
• Converting a numbered list into a different type of list can be very useful
• Changing the order of list items is nice