Port pycsw website to Jekyll

So far this is just taking the content from the existing site and moving it into markdown + Jekyll. I've gone through

- [x] Home
- [x] Community
- [ ] Docs
- [x] FAQ
- [x] Download
- [ ] Development

There's room for some restructuring here -- this is just a first cut / getting it Jekyll-ized. 

__note__: I converted the [Live-Deployments wiki page](https://github.com/geopython/pycsw/wiki/Live-Deployments) to [GeoJSON](https://github.com/rclark/pycsw/blob/website/live-deployments.geojson) to take advantage of GitHub's auto-rendering and embedding. This is simpler to maintain for the site, maybe a little more complex to maintain the data, but [geojson.io](http://geojson.io) is pretty easy.

I don't know if you want to leave this open and I'll keep making commits to it, or if you may want to merge so you can work on it as well? Not sure what the best workflow is here.