Tags

[matfire]

If present in the frontmatter, like so:

tags:
- tag1
- tag2

publishing should find them and adapt them to each publishing platform (if said platforms requires tags).
This implies creating a new method on the BasePlatform interface called setTags and implementing it in each platform definition as well as during the publish api call. If the platform does not support tags, this function can be a no-op.

NB: platforms implement the builder pattern, so setTags must return a reference to itself