Copy popup explainer from mfreed7 repo#490

Merged

gregwhitworth merged 5 commits intoopenui:mainfrom mfreed7:new_popup

Mar 18, 2022

+1,235-289

Commits on Mar 16, 2022

Add new explainer from mfreed7 repo, and add alerts to the top of old explainers
mfreed7
committed

Commits on Mar 17, 2022