Do not generate any documents when copying H5BP. This just gets in the
way of the content I am going to create (and isn't working anyway
because site.origin is not defined).
Only copy the things from H5BP that we really need, plus preserve the
licences in a subdirectory to avoid cluttering the site.
Copy various assets from the H5BP into the root of the src folder and
add a copy:srcrootfiles task to copy them to the output folder. This
allows us to override them in our site if we so wish, without worrying
about whether the H5BP will overwrite them.
Rename the output directory to simply "out". This is a more generic term
than "_gh-pages". Some of us want to deploy to other places...
Simplify the default template and provide an index.hbs page that is
actually useful. More to come...