Remove Ukraine pages from the exemptions list

Remove Ukraine related guidance from the single page notifications
exemption list.

Relevant pages:
- https://www.gov.uk/guidance/taking-humanitarian-aid-out-of-great-britain-to-support-ukraine
- https://www.gov.uk/government/publications/immigration-information-for-ukrainians-in-the-uk-british-nationals-and-their-family-members
- https://www.gov.uk/guidance/ukrainian-nationals-in-the-uk-visa-support
- https://www.gov.uk/guidance/support-for-family-members-of-british-nationals-in-ukraine-and-ukrainian-nationals-in-ukraine-and-the-uk
- https://www.gov.uk/guidance/apply-for-a-ukraine-family-scheme-visa

We have the go-ahead to do this now.

app/presenters/content_item/single_page_notification_button.rb

@@ -6,11 +6,6 @@ module SinglePageNotificationButton
       70bd3a76-6606-45dd-9fb5-2b95f8667b4d
       a457220c-915c-4cb1-8e41-9191fba42540
       5f9c6c15-7631-11e4-a3cb-005056011aef
-      0ea26b38-7858-46f3-8774-72aaffbdf9be
-      912cb994-4ed6-448d-9632-af3910491fc0
-      3aa39dfe-642c-47df-bb86-39a64f9c1d58
-      cd539d2b-aade-4495-bcad-7b8ab963270b
-      29d4e5c4-cc10-4e69-837a-2e2622acf074
     ].freeze
 
     ALLOWED_DOCUMENT_TYPES = %w[