[WIP] Berlin schedule work

[mxsasha]

This PR is to play with possible schedules, having been fixed for the missing writing day. The fixes in the templates will have to be merged into main even if the rest if this PR is not.

Also note the flags set in the config - notably, you can't set flaghasschedule without also setting flagspeakersannounced, or the schedule key will be missing from the context.

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📚 Documentation preview 📚: https://writethedocs-www--2399.org.readthedocs.build/

[plaindocs]

Thanks @mxsasha

Mostly I propose we start later on both days :-D. Probably something like

• intro at 9:30 on Monday, and first talk at 9:30 Tuesday.
• which would also bump lunch later, which I think is a good thing
• we should probably remove the social till we know how we're doing that?

Direct link to the current status of the schedule.

@ericholscher @katiejano @MissMikeyMay ?

[ericholscher]

We always started Prague at 10am I believe, but don't feel too strongly.

The big change we discussed in Portland was making a 5 minute Q&A, instead of 10, and that isn't reflected here.