[docs] New 404 template example

[suzubara]

Does this documentation relate to a specific USWDS feature?

USWDS 2.11.0 introduced a 404 page template. We should replicate this in our Storybook.

[mvogelgesang]

@suzubara I'm interested in picking up this issue. While USWDS provides the markup as a page template, making it a component could enhance its ability to support other error codes and messages. Would a pull request that includes both a component and page template be fine?

[svalexander]

@suzubara I see there hasn't been a pr for this issue so I gave it a go. Do I need permission to be able to assign the issue to myself and create the pr? I've tried pushing up my branch to main as described in the "Contributing" doc but it's failing due to permissions issues.

[brandonlenz]

Added in #1911