- [X] When inserting marker (because data is not yet synced, this must be inside an overlay too)
  - [X] When removing all org-trello data, overlays destruction!
  - [X] When removing a checkbox/item entity, the associated overlay must be removed too.
Begin killing all entities
Update docstring
Create a new function to move the caret on next checkbox with same level
as parameter.
Fix delete card region
  - [X] When removing card, overlays present in the card region must disappear too.
Already done it