Fix spacing on mobile for show page

[FelixMalfait]

cc @Bonapara

We should add space before the image and after the button group

I think we should also add a border-bottom to the last element - here "Projects" (same at the border-top), as it makes it seem Timeline/Tasks/etc are part of project

[hnrykm]

@FelixMalfait Can I pick this up?

[FelixMalfait]

Sure @hnrykm thanks!

cc @Bonapara for more clear directions

[Bonapara]

1. We should add a border-top (color: Light)
2. & 3. We should add a padding of 64px before and after the empty state placeholder.

[FelixMalfait]

@hnrykm let us know if we should unassign you or if you're working on this. Thanks a lot :)