Publications - add some docs around localgov_publications

[finnlewis]

Just note to see if we can add some documentation about localgov_publications.

CC @aaronhirtenstein @TimDCR @jpoesen

There's a video from Ben here:

https://youtu.be/E_0_YojAiGs?list=PLibxxY4DUV2pf70Py14VEbOeQUtgPXKAn

As a start, we could get a page up with the video embedded.

[millnut]

@finnlewis adding on to this it would be good if we could have the module name in the documentation url e.g. /docs/localgov_publications that way we could add a step to the pipeline to verify a module has documentation publically available