Bug fixes

Reconfig auth class and inheritence of that

See Unpublished 404 - Critical - Unsupported - SA-CONTRIB-2017-021

Fixes the security issues found in https://www.drupal.org/project/unpublished_404/issues/2752665.

• Simplify install script and collect sitePath from the developer
• Improve config page to be aware of the help modules existence or not
• Improve help page text and links
• Add 'configure' route key to info.yml

Changes since 8.x-1.0-alpha2:

• Revert "Issue #2912243 by Andrew Answer: Add AJAX to counter"
• #2922521 by sylus: Panelizer entity_field won't display vud votes