alter logic for insufficiency so that a count of 0 survey item responses is enough to trigger insufficiency

Implement large speed improvements to score calculations.  Add page caching to all pages.  Small speed improvements to response rate by filtering out
survey items without responses with `none?` `method vs count == 0`.

spec/system/sqm_application_spec.rb

@@ -6,7 +6,7 @@ describe 'SQM Application' do
   let(:academic_year) { create(:academic_year) }
   let(:category) { create(:category) }
   let(:measure) { create(:measure) }
-  let(:scale) { create(:scale, measure:) }
+  let(:scale) { create(:teacher_scale, measure:) }
 
   before :each do
     driven_by :rack_test