Update Events page with recent news & check formatting

[pgleeson]

https://openworm.org/events.html

See here for previous views: #99

Might be simplest to just view as plane table

[pgleeson]

Hrm... seems like it is broken initially and then on reload looks fine.
It does ned more rrecent events, so have changed title here, events can be taken from the newsletters: https://openworm.org/news.html