Show error on invalid page

[ghost]

Signed-off-by: Ariana Isabel Hlavaty arianahl@uk.ibm.com

Contributes to #218

What did you do?

Added a Not Found page and a redirect to the landing page after 2 seconds

Why did you do it?

Open issue requested these changes

How have you tested it?

Locally

Were docs updated if needed?

• [ ] No
• [ ] Yes
• [X] N/A

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [X] My changes generate no new console logs
• [X] Fixes entire issue
• [ ] Partial fix for issue

[ghost]

The Not Found page currently looks like this

:

[upkarlidder]

+1 with your suggestions.

Thank you @arianahl!

[GeraldMit]

@GeraldMit @upkarlidder what do you think of this? I think it's a great update.

I agree!

[ghost]

I've added the AppHeader and translation. I also took the liberty of adding the Spanish translation to it. New updated page looks like this