WYSIWYG in BS

Acceptance criteria

1. Add WYSIWYG to:

   • Feedback between questions/content (both text and a title)

   • Branching question (only to the question field, not to alternatives)

2. Add WYSIWYG with only a link option to:

   • Start screen, default end screen, custom end screen (both text and a title). Note: I guess other options are fine too as long as we do not have color and size adjustments on start and end screens

3. Make sure all of those fields can display long text properly (scrollbar should appear if there is too much text)