[Docs] Revamp of BP section in Oniro RTD

Closes: #1 (closed)

We have some unsupported blueprints, whereas others require changing dependencies

@kristis and I changed some of the doc files to make them updated, as booting.oniroproject.org site will be disabled soon

Signed-off-by: Grzegorz Gwóźdź grzegorz.gwozdz@huawei.com