Add Homepage link to 404 and improve its apology

[rlaphoenix]

This is an enhancement or feature.

Summary

This makes the 404 page more visually appealing as well as more functional, more of a reason to exist.

Context

N/A

[rlaphoenix]

Preview:

[github-actions]

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[rlaphoenix]

Any further review? potential merge?

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity.

This pull request will automatically be closed in 7 days if no further activity occurs. Thank you for all your contributions.

[mmistakes]

Thanks for the PR but closing this with the wontfix label.
The 404 page here is just an example I'm using for the demo site. It can easily be customized as you have to fit your site's needs.

[iBug]

@mmistakes Honestly I'd say it's better to merge this in. It's certainly an improvement for your docs site, and you know, there could be more 404 links from time to time as the docs are updated and whatever happens...

[mmistakes]

@iBug Don't think I agree. I'm seeing a slightly reworded error text and a home link that already exists in the masthead.