Use Jekyll to generate the meeting list

Introduce Jekyll and Liquid templating to help with the later issues which will likely require using layouts and includes.

The main example here is lifting the actual meeting information into a separate [Jekyll data file](http://jekyllrb.com/docs/datafiles/) which is then used to automatically generate the list on the front page. I was hoping that we could even dynamically separate past and future meetings with a [filter](http://jekyllrb.com/docs/templates/#filters) but alas that doesn't seem possible and it would only change when we pushed changes to the site anyway.

We can then use a similar pattern for a list of members and make it trivial to add yourself without having to get involved in the actual page design.