Add search capability

It would be great if the generated github pages website had a built in search capability.

One option could be Algolia which has both a Jekyll plugin and an Open Source license/offering:

* Jekyll plugin : https://community.algolia.com/jekyll-algolia/
* Algolia for Open Source : https://www.algolia.com/for-open-source/

Thanks to @ChristianMurphy for the heads up.