0.2.0

- [X] Version
- [X] Improve cleanup of the org-trello metadata
- [X] Videos about org-trello
  - [X] Webadmin
  - [X] Checkbox
  - [X] Sync from trello
  - [X] Cleanup trello board
  - [X] Cleanup org-trello buffe
- [X] Reference videos to README
- [X] Improve sync to trello
- [X] Release notes