Improve `type` for `webLink` properties

[austinkelleher]

Example of a case that causes the schema validation to fail:

https://abc.com/<abc>

I think we should consider a more permission type that matches URLs with or without a protocol.

[aiwilliams]

To clarify, is this the acceptance criteria you're suggesting?

• [ ] Allow <> characters in webLink values
• [ ] Allow any URI scheme value, including everything listed at https://en.wikipedia.org/wiki/List_of_URI_schemes