Project: New styling

Minor styling tweaks to reduce the visual impact of the project header.

Steps

~~New project header~~
~~Page: Overview~~
~~Page: Updates - index/show/edit/new/confirm-delete~~
~~Page: Threads - index/show/edit/new/confirm-delete~~
~~Page: Tasks - index/show/edit/confirm-delete~~
~~Page: Settings~~
~~Page: Overview styling~~
~~Clean up: No longer need to fetch follow in project header plugs~~