Add basic deadline to sections index

app/controllers/sections_controller.rb

@@ -1,6 +1,11 @@
 class SectionsController < ApplicationController
   def index
     @sections = Section.all.order(id: :asc)
+    @extensions = Extension.all.order(id: :asc)
+    @deadline = Time.zone.local(2025, 7, 8, 0, 0, 0)
+    @extensions.each do |e|
+      @deadline = e.affect_deadline(@deadline)
+    end
   end
 
   def show