Add the option to re-arrange sub-projects in the parent's show action

[arielj]

https://ombulabs.atlassian.net/browse/DT-247

Branch/Commit:

Main branch

Describe the feature:

When I need to re-arrange the sub-projects of a given project, I want to be able to do that from the show action of that project.

Problem:

Currently, the only place to re-order sub-projects is in the list of projects

Mockups:

The show action of a project could show the sub-projects cards listed supporting draganddrop.

I will abide by the code of conduct

[mcelaney]

So I'd like to propose a change to the layout but we maybe need a design-minded someone to advise?

Overall idea:

Breakdown

Header link always goes to /products

Left "Hierarchy" Nav is always there

With "archive" under the project link (since we don't want to archive sub-projects separately) and "Add Sub Project" under the sub-projects list (if available).

Highlight the current page in the hierarchy we're on

Use the same drag and drop component as we do on "/projects"

This looks... awkward... because I just mooshed some css around to demonstrate the idea... but if we could clean up the visuals this would maybe solve a few issues in addition to us being able to keep the UI the same for reordering sub-projects.

Thoughts?