Runbot layout modifies the website/portal base layout to remove navbar,
footer, overides some custom styles. A lot of assets are loaded but not
used. The only real usefull elements are base assets (bootstrap, ...)
and the login button.
Migrating to the next version of odoo is usually painfull because some
xpath may break, extra element added, or some style change may break the
page, needing to add more and more xpath, css rules, ... for very little
benefits.
This cleanup creates a custom base layout for runbot independant from
base odoo templates.
Also add a breadcrumb, navigation arrow, and improve batch links
