UHF-10542: Update maintenance page links

[Arkkimaagi]

UHF-10542

• Maintenance page links need to be updated

What was done

• Links were updated

How to install

• Make sure your instance is up and running on latest dev branch.
  • git pull origin dev
  • make fresh
• Update the HDBT theme
  • composer require drupal/hdbt:dev-UHF-10542_maintenance_links
• Run make drush-cr

How to test

• Set your instance to maintenance mode from /admin/config/development/maintenance
• Open the maintenance page in incognito mode
• Check that links point to correct places
• Check all language versions: fi, sv, en, (others fall back to en-language)
• Check that code follows our standards

Continuous documentation

• This feature has been documented/the documentation has been updated
• This change doesn't require updates to the documentation

[github-actions]

⚠️ Visual regression found! Please check if this change is wanted or accidental. You can check the output here: https://city-of-helsinki.github.io/drupal-hdbt/pull/1086/html_report/

[teroelonen]

This looks good 🦖