edit authors, delete users, UI changes

app/controllers/application_controller.rb

@@ -10,10 +10,18 @@ class ApplicationController < ActionController::Base
     !current_user.nil?
   end
 
+  protected
+
   def notices_from_errors(record)
     messages = record.errors.messages.map do |attribute, messages|
       messages.map { |message| "#{attribute} #{message}".capitalize }
     end
     messages.flatten
   end
+
+  def ensure_admin
+    unless current_user&.admin?
+      redirect_to '/welcome', notice: 'You are not allowed to perform this action'
+    end
+  end
 end