Remove printing-setup-networked.page.stub and take network-printer-config.page from sysadmin guide
While going through stub pages in the user docs, we came across
printing-setup-networked.page.stub, which is old and needs revision, and also
network-printer-config.page from the sysadmin guide, which is considerably more current.
Move the sysadmin one to the user docs, make sure that it is linked up appropriately, and review it for the current control centre.