Cleaning up the apt-sources README to be easier to consume. Also removing some tripleo references from the README. Change-Id: I6937fd5cd51288b36890dde214701bcef1d61381
We currently do not have the ability to create a docs site which outlines all the elements. Change-Id: I77ccf61e0c4b1509b3e7ce9b8f15ea5ccfd50d9b