Migrate SE content on choosing a CMS

Created by: seancolsen

This StackExchange question has more up-votes than any other question:

https://civicrm.stackexchange.com/questions/34/how-is-civicrm-different-in-drupal-joomla-and-wordpress

I think it would be helpful to copy some of that content into this page:

https://docs.civicrm.org/sysadmin/en/latest/planning/cms/