Updating the project contacts section to use the new team-api format.

[DavidEBest]

• Updates the project template to use the url & text fields, if present.
• Updates the example data to use the new format.
• Removes the (now unnecessary) contact field munging fromt the dashboard plugin.

This attempts to do the right thing for contact fields with the following formats:

contact:
- url:
  text:
- url:
  text:

contact: email@host.tld

contact: mailto:email@host.tld

contact: https://github.com/org/proj/issues

contact: https://www.github.com/org/proj/issues

contact: org/proj/issues

Implements #254

[gboone]

Thanks @DavidEBest