[x] After you preview a lesson, you are no longer able to edit center area of text (gray text), only the green text.
[x] Can we make it so the feedback window only appears for steps that you add the dynamic elements to (ie Open button or API)? Feel like the feedback window is a little confusing right now as it doesn't appear for most steps and don't want to make lesson creators do a ton of extra work. Other thought would be to have it appear for every step when doing the lesson, but that might be overkill and also confusing when it sometimes auto advances to feedback and sometimes doesn't.