Temporarily remove news from main navigation

[ivan-kocienski-gfsc]

Description

This faeture is half implemented so we should remove till it's done properly. It is only being fully used via the API on Trans Dimension.

Acceptance criteria

• [ ] Move "Articles" to "In development" section of admin interface
• [ ] Remove "News" from site.placecal.org navigation where it appears (but leave the pages so we can go to them manually)

Next steps

Articles need to be re-worked so they function with the newer tagging system, which is still in progress. They should be hidden until we can figure out how they work together.

[kimadactyl]

don't remove as they are in use for transdim - but do move to "in development"

this was more about the site.placecal.org/news tho! i'll update the ticket