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_config.yml: no 'mailto' in 'email'
Closes swcarpentry/styles#283
`site.email` is used as:
_includes/lesson_footer.html: <a href="mailto:{{ site.email }}">Contact</a>
_includes/workshop_footer.html: <a href="mailto:{{ site.email }}">Contact</a>
Therefore, it does not make sense to have `mailto` in the `email` itself.