Remove all format specifics from guide

[simondueckert]

• Formats: self paced learning, tandem circle
• Rework Circle/Tandem moderator/organizer/facilitation checklist
• remove all format specifics from guide (e.g. "Talk about ... in your circle")

[simondueckert]

Add moderator checklist to appendix (again). Reason: people do not find it.