Tidied up config.yml and added the correct url.
Tidied up config.yml and added the correct url.

barnabysmithmusic/barnabysmithmusic.github.io,barnabysmithmusic/barnabysmithmusic.github.io,barnabysmithmusic/barnabysmithmusic.github.io,barnabysmithmusic/barnabysmithmusic.github.io