[MOOSE-353]: Add new announcements settings

[MlKilderkin]

What does this do/fix?

1. In the ‘Setup’ tab, add a new setting called “Orientation”
2. Options for Horizontal (default) and Vertical
3. Mobile will always be stacked. Desktop will use this option.
4. When Vertical layout is applied, Dismiss button should be top aligned.
5. When Vertical layout is applied, the content should have a max-width, and there should be be sufficient padding between content and dismiss button. (See screenshot)
6. Add the same functionality to the ‘Announcements’ block as well.

QA

Links to relevant issues

• https://moderntribe.atlassian.net/browse/MOOSE-353

[dpellenwood]

🍏 Looks great overall, Myk. I'd like Geoff's input on the editor styles a bit before it merges though.

[dpellenwood]

I'd like to see these css selectors nested a bit, and I wonder if we want to use a container query here rather than viewport queries. @GeoffDusome , I'd be curious your thoughts on this, too.

[GeoffDusome]

🟢 Seems to work great, Myk. Thanks for tackling. I pushed a commit to fix some of the styling and just generally clean things up. Should be good to go now.