Feature: Search bar

Created by: holdenmad

I'm a bit new to this, so please tell me if I'm not following the contributing guidelines well enough.

It would be great to have a search bar on the website, since there is a lot of fantastic content. At the moment, there's no way to search all of the content, which I think is a shame since there are so many blog posts, articles, checklists, etc. which people could find more easily with this feature.