Handle empty pages by 404

* Render a 404 instead of an empty services and info page
* Update gds_api_adapters gem to version 12.4.1 to use Rummager test
  helpers
Sort services and info data by title

Adds search query param to get Rummager response alphabetically sorted by title
Adds styling tweaks to "see more" links
Actions PR comments
Merge pull request #1613 from alphagov/tweaks-to-services-and-info-pages

Tweaks to services and info pages