Fix bug include template when plugin disabled

When plugin is disabled from config the template not found because the
plugin is not loaded. Added a config validation before include the
template file because this plugin is not required for theme. Update
version.
Fixed readme

Fixed readme with default variables.
Added 'muut' comment system

Added Muut comments/forum system inside Grav. Muut is setup for comment
system (not for forum) then the options is only for working with
comments. Updated to 1.0.5.