Integrate licensing

[QuazChick]

Allows pages to be licensed, with the option to provide separate licensing for code samples.

Licensing is achieved through the optional license frontmatter parameter in pages. It can be specified as a string or object:

license: CC-BY-4.0

license:
    main: CC-BY-4.0
    code: MIT

Each license ID refers to a page at docs/licenses/<ID>.md. These pages must include a source frontmatter parameter to link to the original website that the license text was copied from.

Full Example

---
title: License Test
license:
    main: CC-BY-4.0
    code: MIT
mentions:
    - QuazChick
---

This is a test.