FEATURE: Add hidden site settings for discobot to skip certain tutorials

Hidden for now because I'm undecided on whether this should be an
exposed interface.

plugins/discourse-narrative-bot/lib/discourse_narrative_bot/base.rb

@@ -30,7 +30,12 @@ module DiscourseNarrativeBot
             next_opts = self.class::TRANSITION_TABLE.fetch(next_state)
             prerequisite = next_opts[:prerequisite]
 
-            break if !prerequisite || instance_eval(&prerequisite)
+            if (!prerequisite || instance_eval(&prerequisite)) && !(
+              SiteSetting.discourse_narrative_bot_skip_tutorials.present? &&
+              SiteSetting.discourse_narrative_bot_skip_tutorials.split("|").include?(next_state.to_s))
+
+              break
+            end
 
             [:next_state, :next_instructions].each do |key|
               opts[key] = next_opts[key]