use .Site.BaseURL for assets

[ripienaar]

all assets have hardcoded paths like /css should be baseurl related

[matcornic]

Thanks @ripienaar for your PR :)

Actually, you're not the first to create this specific one. See #6 & #9 & #3

Instead of putting baseurls, you could use the obscure Hugo parameter named canonifyURLs = true (as I did in the documentation : https://github.com/matcornic/hugo-learn-doc/blob/master/config.toml#L6 )

But as your are not the first to share this (and I think you won't be the last if this does not change), I will accept your PR. It will be more obvious and straightforward for everybody (cc @nimmaj @fanningert @TimNN)

[ripienaar]

oh thats what canonifyURLs does :) docs really not clear, I saw other themes used the baseurl that seemed a lot more obvious

thanks for the merge and the theme!