This commit removes Notary and Content Trust.
Notary v1 is due to be replaced with Notary v2 soon.
There is no clean migration path from one to the other.
For now, this removes all signing from LinuxKit.
We will look to add this back once a new Notary alternative
becomes available.
Signed-off-by: Dave Tucker <dave@dtucker.co.uk>
This covers the base docs; I also did a bunch of cleanup and
remove old docs that are no longer needed.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
