[docs] update glossary
[docs] add note to old dataflow doc
[docs] add beginnings of pipeline doc.
[docs] add a ref tag to releases.
[docs] start release notes
[docs] Update the jobpack page.
[docs] Some repairs to release notes.
[docs] Update the worker protocol page.
[docs] mention save_results in jobpack page.
Add release process doc to repo.
[docs] fix hanging ending for dataflow page.
[docs] add some images to pipeline doc.