Allow users to add GitHub and Google+ profiles

What does this MR do?

Allows users to add links to their GitHub and Google+ profiles

Are there points in the code the reviewer needs to double check?

Tests for the features

Why was this MR needed?

Requested in issue #21586 (moved)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #21586 (moved)