Move some migrated pages over to the User Guide

Created by: seancolsen

I migrated these wiki pages into this guide but now think that they should go into the User Guide instead:

• https://docs.civicrm.org/sysadmin/en/latest/setup/users-contacts/
• https://docs.civicrm.org/sysadmin/en/latest/setup/mapping/
• https://docs.civicrm.org/sysadmin/en/latest/config/addresses/
• https://docs.civicrm.org/sysadmin/en/latest/config/dates/
• https://docs.civicrm.org/sysadmin/en/latest/config/error-handling/
• https://docs.civicrm.org/sysadmin/en/latest/config/resource-urls/