As it was before, you could not have multiple project status buttons on
the same page - unless they were read-only. When updating, the lack of a
unique key would always update the first occurrence in the DOM instead
of the button the user clicked.
* Updates `StatusButtonComponent` to use `turbo-method: :delete` for
"Not set" menu item.
* Adds `Projects::StatusController#destroy` action, routes and
accompanying permissions.
* Introduces `Projects::StatusButtonComponent` and its Lookbook Preview.
* Defines colours, icons as (Ruby) constants nested under
`Project::Statuses` (c.f. `Meetings::Statuses`).
* Adds `Projects::StatusController` with `#update` action, routes and
accompanying permissions.
Henriette Darge