Update copy and add Zendesk link

This matches the approved designs

lib/engines/content_block_manager/app/views/content_block_manager/content_block/documents/index.html.erb

@@ -1,12 +1,23 @@
-<% content_for :context, product_name %>
-<% content_for :title, "All content blocks" %>
+<% content_for :title, product_name %>
+<% content_for :title_margin_bottom, 6 %>
 
 <div class="govuk-grid-row govuk-!-margin-bottom-8">
   <div class="govuk-grid-column-full">
-    <%= render "govuk_publishing_components/components/button", {
-      text: "Create new object",
-      href: content_block_manager.new_content_block_manager_content_block_document_path,
-    } %>
+    <p class="govuk-body govuk-!-margin-bottom-1">Create, edit and use modular content.</p>
+    <p class="govuk-body">If you need any support or want to delete a content block, you can raise a support request.</p>
+    <span class="govuk-!-margin-right-2">
+      <%= render "govuk_publishing_components/components/button", {
+        text: "Create new object",
+        href: content_block_manager.new_content_block_manager_content_block_document_path,
+      } %>
+    </span>
+    <span>
+      <%= render "govuk_publishing_components/components/button", {
+        text: "Raise a support request",
+        href: "https://govuk.zendesk.com",
+        secondary_solid: true,
+      } %>
+    </span>
   </div>
 </div>
 

lib/engines/content_block_manager/features/step_definitions/content_block_manager_steps.rb

@@ -244,7 +244,7 @@
 end
 
 Then("I should see the details for all documents") do
-  assert_text "All content blocks"
+  assert_text "Content Block Manager"
 
   ContentBlockManager::ContentBlock::Document.find_each do |document|
     should_show_summary_card_for_email_address_content_block(
@@ -595,7 +595,7 @@ def click_save_and_continue
 end
 
 Then("I should see the content block manager home page") do
-  expect(page).to have_content("All content blocks")
+  expect(page).to have_content("Content Block Manager")
 end
 
 When("I click to copy the embed code") do