docs(windows): write a msi deployment knowledge base article

Write a knowledge base article on an msi deployment, including the need to keep the .msi around for Windows Installer servicing requirements.
The article could reference https://help.keyman.com/knowledge-base/?id=35 which may be an option also to use with a distributed deployment tool. See https://community.software.sil.org/t/keyman-installs-on-workstations-suddenly-requiring-non-existant-msi-package/10160/12