Need a way to mark exentions as source and/or target

[htollefsen]

Would be nice to have a badge-class or something to clearly show extensions as source and/or target. E.g.: Transfer ezplatform only implements the TargetAdapterInterface, so would be informative to show this in the docs.

@htollefsen A quick fix is to append the badge name surrounded by back ticks. Ex: target

This is how it would look:

The CSS will be tweaked, of course.

[htollefsen]

That'll do! Nice.