Simplify client building and installation instructions.
Simplify client building and installation instructions.

Signed-off-by: Trishank K Kuppusamy <ffb584f9ddcd71111a00c49dd75b44f4e2d58746@datadoghq.com>

docker/notary,endophage/notary,johnsandiford/notary,jfrazelle/notary,jfrazelle/notary,endophage/notary,HuKeping/notary,HuKeping/notary,endophage/notary,docker/notary,HuKeping/notary,jfrazelle/notary,johnsandiford/notary,johnsandiford/notary,docker/notary