Added sass cache files to gitignore.
Un-centred content on the search results page.
Site search now searches for categories as well as posts.

To do this, the previous search function has been rewritten so that it will search a key that is passed as an argument. The search isn't perfect. Ideally, searching for something like “river rejuvenation” would produce the page titled “rejuvenation” in the river category but at the moment it won't.
Hyphens are now stripped from categories in the search index.
Removed a console log from the search page.