Fix spacing for different list item types
The spacing for list items are currently all over the place.
The above results in:
Code for above image
``` * list 1, item 1 * list 1, item 2 * list 1, nested list item 1 * list 1, nested list item 2 * list 1, item 3- list 2, item 1
- list 2, item 2
-
list 1, item 1
-
list 1, item 2
- list 1, nested list item 1
- list 1, nested list item 2
-
list 1, item 3
-
list 2, item 1
-
list 2, item 1
-
list 1, item 1 -
list 1, item 2 -
list 1, nested list item 1 -
list 1, nested list item 2
-
-
list 2, item 1 -
list 2, item 2
</details>
## Mockup
Instead, list items should result in the following:
![list-items](/uploads/73c704f65fde62fb68643a5684c47661/list-items.png)
Spec previews: https://gitlab-org.gitlab.io/gitlab-design/hosted/taurie/list-items-spec-previews/
Edited by Taurie Davis