Remove references to core plugins in artifact deployment instructions

Core plugins are no longer built with Maven.  Remove the related parts
from the deployment instructions.

Change-Id: I05d9b47c50681600de2c82893d56bf685aead315
Revert "Change Size column to show +X, -Y instead of a bar"

This reverts commit d2fc7153277eef691bda2632fb20c4084ec6672c.

Change-Id: I800e54d037d9872ce2665ce398c5dec84c8d71f4
Merge "Revert "Change Size column to show +X, -Y instead of a bar""
Merge "Remove references to core plugins in artifact deployment instructions"