Introduce new keys

[ckenst]

I think it makes sense to introduce new keys specifically for the CFP process. Right now we put everything into the status key and it makes it more challenging for later.

We should also introduce other keys for:

1. Mastodon, Bluesky -> we could programmatically display the icon when relevant
2. Timezones
3. Code of conduct?
4. start_date + end_date -> enables a downloadable ico for calendars
5. CFP link, cfp_start_date, cfp_end_date