Update getting-started docs to use the new "upstream job" button
The next modelbuilder-ace3p release will have a new feature for setting the path to computed results for input to Track3P and TEM3P. This MR updates the getting-started doc to use the new (and greatly-simplified) approach.
A preview copy of the modified docs are at https://f001.backblazeb2.com/file/kitware/ace3p/docs/index.html . The only changes were made to two pages:
Edited by John Tourtellott