bitbake: toaster: add project pages for machines, targets, layers

bitbake: toaster: add project pages for machines, targets, layers

We add new pages for the all-machines and all-targets
project-related views.

We update the existing template structure to create
a base project view, similar to a base build view, that includes
a breadcrumb.

Updating existing all layers view to use the new structure.

We update methods in the models to provide corrent
information display.

[YOCTO #6592]
[YOCTO #6593]

(Bitbake rev: 973f582a19441c1ec67061160e4c50ce03ed7b68)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>