Neka custom error page

[nekablair]

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

• [ ] Feature
• [ ] Refactor
• [ ] Bug Fix
• [ ] Optimization
• [ ] Documentation Update
• [x] Other (please specify here: )

Description of what this Pull Request does

Adding 404 page to app

Related Tickets & Documents

• Closes #168
• Related Issues: (enter ticket numbers here)

QA Instructions, Screenshots, Recordings

Added/updated tests?

• [ ] Yes
• [ ] Not Yet, and here is why: explain here
• [ ] I need help with tests
• [x] No, and here is why: no testing being done

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[nekablair]

Unintended commits added to this PR, will produce another clean PR.