Transfer repositories

[niccokunzmann]

I have transferred a few repositories.

These could also be transferred:

• https://github.com/niccokunzmann/icalendar_compatibility
• https://github.com/niccokunzmann/fast-api-get-next-ics-events (old project)
  This can showcase using icalendar with fastapi
• https://github.com/niccokunzmann/my-mailbox-calendar (old project)
  This allows you to create a calendar just from having an email address and inviting the calendar to your events. Might be a nice idea for a project - for people who have email but no online calendar.

[SashankBhamidi]

I've transferred icalendar-anonymizer from mergecal org.