change to use BaseURL

[mattstratton]

Something I hadn't considered was that sites that aren't hosted off of root will not work properly with "/".

Need to find all the references to just "/" and change them to use BaseURL.

I'm not sure what this will do with the deploy previews thing on Netlify though...which isn't a problem for me, per se, but for people using the theme.

[mattstratton]

For testing, can try this:

baseurl = "/"
canonifyurls = true