refactor: create a custom 404 page for app dir

[vnugent]

What type of PR is this?(check all applicable)

• [x] refactor
• [x] feature
• [x] bug fix
• [ ] documentation
• [ ] optimization
• [ ] other

Description

Related Issues

Issue #1100 #1096

What this PR achieves

• Add a global 404 page for Next.js 13 app dir (issue #1100)
• Introduce a global class for standard page width (issue #1096)

Screenshots, recordings

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