Use `jshint.org` as default domain

The `jshint.com` domain is configured via domain registrar account
configuration as per GitHub's recommendation [1].

[1]
https://help.github.com/articles/my-custom-domain-isn-t-working/#multiple-domains-in-cname-file
Force new site deployment commits

Because each deployment is modeled as a commit on top of the latest
version of the `dev` branch, each new deployment is expected to discard
the previously-deployed commit.
Specify `www` subdomain