Problem/Motivation
After uninstall the help module, the demonstrate block regions link is not displayed anymore on Block layout page.
Of course as a "smart" user you can go directly to /admin/structure/block/demo/{theme} and see the theme regions demonstration, but from the usability perspective this is a regression.
This problem not happen in drupal 7 because the owner of the hook_help() is the system module (always enabled) whereas in drupal 8 the owner of hook_help() is the optional help module
In my opinion demonstrate block regions link is a functional link not an help and it should not depends on help module
Proposed resolution
TBD
