Revert "form: add number to section headers"

This reverts commit f42977e40a.

app/models/champs/header_section_champ.rb

@@ -2,11 +2,4 @@ class Champs::HeaderSectionChamp < Champ
   def search_terms
     # The user cannot enter any information here so it doesn’t make much sense to search
   end
-
-  def section_index
-    dossier
-      .champs
-      .filter { |c| c.type_champ == TypeDeChamp.type_champs.fetch(:header_section) }
-      .index(self) + 1
-  end
 end

app/views/shared/dossiers/editable_champs/_header_section.html.haml

@@ -1,6 +1,2 @@
-- section_index = champ.section_index
-
 %h2.header-section
-  - if section_index
-    = "#{section_index}."
   = champ.libelle

spec/models/champs/header_section_champ_spec.rb

@@ -1,26 +0,0 @@
-require 'spec_helper'
-
-describe Champs::CheckboxChamp do
-  let(:types_de_champ) do
-    [
-      create(:type_de_champ_header_section, order_place: 1),
-      create(:type_de_champ_civilite,       order_place: 2),
-      create(:type_de_champ_text,           order_place: 3),
-      create(:type_de_champ_header_section, order_place: 4),
-      create(:type_de_champ_email,          order_place: 5)
-    ]
-  end
-
-  let(:procedure) { create(:procedure, types_de_champ: types_de_champ) }
-  let(:dossier) { create(:dossier, procedure: procedure) }
-
-  describe '#section_index' do
-    let(:first_header)  { dossier.champs[0] }
-    let(:second_header) { dossier.champs[3] }
-
-    it 'returns the index of the section (starting from 1)' do
-      expect(first_header.section_index).to eq 1
-      expect(second_header.section_index).to eq 2
-    end
-  end
-end