Pretalx: New domain for Summit 2023

• Takes place in the 2nd half of September 2023.

Tasks

• Summit 2023: Use https://summit2023.matrixmeetup.de/
  • DNS entry
  • nginx config
  • HTTPS cert job
  • Add link on matrixmeetup.de
• Optional: Summit 2022: Move from https://cfp.summit2022.matrixmeetup.de/ to https://summit2022.matrixmeetup.de/