[EOSF-926][COS] Add expanded-ambassador

[baylee-d]

Purpose

Add expanded-ambassador template which has more information (if in table) and formatted like the concise-team template.

Changes

• Add expanded-ambassador option, shows:
  • First/last name
  • Position
  • Employer
  • Social icons
• Add 'employer' field
• Move 'position' field data to 'employer' if the person is an ambassador

Ticket

https://openscience.atlassian.net/browse/EOSF-926

[baylee-d]

Passing build: https://travis-ci.org/baylee-d/cos.io/builds/325090224