[2.0.0-beta1] Remove breadcrumb component

Problem/Motivation

Breadcrumb component doesn't exist in upstream Material 2: https://m2.material.io/components?platform=web

So we took the one from Michael Richins. It nice but looks a bit odd among the other components.

Proposed resolution

In Material 2, something similar than breadcrumb is the up button (which is often a arrow pointing to the left in LTR):

Can we replace breacrumbs component by that?

Remaining tasks

Don't forget to add this button in the "Top app bar" used as header.

Data model changes