Refactor html/css for lists and improve help UI page
- dry lists html/css removing a lot of style duplicates
- fix snippets list to match common style
- fix extra bottom margin for groups list
- improve help page ui so it looks clean
Fixes #11873 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes #11873 (closed)