Redirect offline versions to the archives page

This redirects all offline versions of the docs to the archives page.

It also displays a dismissable banner on the archives page when the user is redirected from an offline version.

• Add logic to redirect all versions listed in content/_data/versions.yaml.
• Create a generic banner component.
• Implement the banner component for outdated versions and offline versions.
• Show banner on archives page when redirected from an offline version.
• Add the ability to dismiss a banner.
• Cross-browser compatibility.
• Add the production conditional back (after testing).
• Add tests for the banner component.

Screenshot

Closes #223 (closed)