Deprecated docker images and repos in voltha docs

In Voltha docs "Resources/Docker Images"(https://docs.voltha.org/master/resources/docker.html) and "Resoursec/Source Code Repositories"(https://docs.voltha.org/master/resources/repositories.html) pages there are deprecated repos and images.

Deprecated/unused list:

afrouter

afrouterd

voltha-bbsim

voltha-dashd

voltha-envoy

voltha-netconf

voltha-ofagent

voltha-ponsim

voltha-ro-core

voltha-shovel

voltha-tester

voltha-voltha

 voltha-adapter-simulated-onu

 voltha-adapter-simulated-olt

voltha-openonu-adapter

voltha-ponsim