Update the tools listed within the Packaging and Transfer Guide landing page

[a-berish]

Update/add the following text from Working in the BitCurator Environment QS Guide

"The Packaging and Transfer submenu lists some tools to assist with safe packaging and network transfer of materials. These include:

• Bagit-Python: A Python library and command line utility for working with BagIt style packages.
• Grsync: A GUI front-end for rsync."

to Packaging and Transfer Guides

[a-berish]

Duplicate of #18