[Toaster] Design - dropping support for stand-alone analysis mode (7711)

[Barros Pena, Belen]

This Bugzilla feature

https://bugzilla.yoctoproject.org/show_bug.cgi?id=7711

Has considerable impact on how users interact with projects. If you can,
please check the design document attached to the Bugzilla feature and
comment as needed.

Thanks!

Belén