Allow changing date and time formats

[colindean]

As of v0.1.0, c-m-i uses server locale for its date and time settings. In my case, this is "America/Chicago", which produces MM/DD/YYYY dates and 12-hr times. I want ISO-8601 YYYY/MM/DD and 24-hour times.

I see where the title is set:

create-meeting-issue/src/lib/output.ts

Line 22 in 07890e8

title: `Agenda for ${date.toLocaleString()}`,

but there's not a clear way to set a locale in this context. I suspect that I could set an environment variable, but I'm not sure which other than trying LC_TIME and trying en_DK or en_SE or eo to get ISO-8601 date and 24-hr time.