Add 404 template with pattern

[carolinan]

Description
This replaces #56 _ only because I was not able to pull down the changes._

I made the following changes:

• Renamed the image file, only removing the -jpeg that was at the end of the name, since the theme will use the webp.
• Added a wrapping group block and made the columns wide, as seen in the recording on the original Pr.
• I changed the heading to H1, which meant I needed to hard code the font size value to match the size of the H2 heading.

[github-actions]

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Co-authored-by: carolinan <[email protected]>

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[cliffralessio]

Ok perfect @carolinan But will I now result on the list of contributors to this project?

[carolinan]

yes!

[carolinan]

I copied all the credits from the previous PR.

[cliffralessio]

Thank you!