Show local times (as well as UTC) for the virtual conference

[MattBlissett]

For the October's conference schedule, assuming it has a similar structure to this week, could we try adding a local date and time to the table? Perhaps as the text of the "Local time" link.

In Javascript, given a nicely formatted UTC date, the browser will convert that to the browser's (i.e. computer's) timezone.

new Date('2020-09-25T12:00:00Z').toString();
Fri Sep 25 2020 14:00:00 GMT+0200 (Central European Summer Time)

I think including the end time would be good too, as I've seen several people mistake how long sessions run. Something like:

INTRO: Introduction to TDWG
08:30 ­– 10:00 (UTC)                  [smaller, grey text]
10:30 ­– 12:00 (CEST)
Primary...

would be best.

(Naturally, check any changes make sense when the computer is set to Line Islands and American Samoa time.)