Use ^1.0.0 versions in package.json.
Move contact form to formspree.io.

It previously used forms.brace.io. Brace.io was acquired by Squarespace
and they shut down forms.brace.io. Formspree.io is the same service, but
run by the community.

Also, I moved from an empty markdown file to a json file for the contact
page. It was unnecessary.
Build.