Author attribution

This page has the following in the frontmatter:

authors:
  - Jan Kowalski
  - john-doe

Jan Kowalski doesn't have a corresponding profile page in the repo at all, so his name should just be displayed as plain text.

john-doe should match /team/john-doe.md based on file name and:

• his full name - John Doe - should be displayed (as set by the title frontmatter field)
• it should link to his profile page.