Description

Creates page layout for 404 pages

For #3693

Additional information

Other notes:

• No new components created specifically for error pages
• Included in the HTML are comments that define a structure that might be useful other types of error pages, or perhaps if a 404 page can be made more robust depending on the application

Before you hit Submit, make sure you’ve done whichever of these applies to you:

• Follow the 18F Front End Coding Style Guide and Accessibility Guide.
• Run npm test and make sure the tests for the files you have changed have passed.
• Run your code through HTML_CodeSniffer and make sure it’s error free.
• Title your pull request using this format: [Website] - [UI component]: Brief statement describing what this pull request solves.