Fix CSS causing cruft at the bottom of release pages

[mdlinville]

Preview: https://deploy-preview-18991--cockroachdb-docs.netlify.app/docs/releases/v24.2.html#v24-2-0-alpha-1

[github-actions[bot]]

Files changed:

• src/current/_includes/releases/new-release-downloads-docker-image.md:
  • releases/releases.md
• src/current/_includes/releases/v24.2/v24.2.1.md:
  • releases/v24.2.md
• src/current/_includes/releases/withdrawn.md:
  • releases/releases.md

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