Add RSS feed to conference list

[ckenst]

This might be a way to address #58.

[ckenst]

You can get access to data files using special variables and make a separate feed with conferences: https://jekyllrb.com/docs/datafiles/

[ckenst]

We have an RSS feed for our pages, but not for the conferences list: https://testingconferences.org/feed.xml

[gpaciga]

Does this just need an xml version of the existing html files for current/past?

[ckenst]

The original idea behind RSS was to be able to pull it into a calendar like Google Calendar (hence #58) where other people could subscribe and stay informed. So in that case we just need an xml version of the current page to try it out.

Really we just need to be able to generate it once, import it into Google Calendar and then make that calendar shareable.