Fix broken 404 page on documentation website #2975 [ Issue resolved ]

[amaan287]

What has changed?

Please include a summary of the change.

This PR Resolves #2975(Fix broken 404 page on documentation website)

Type of change

Please delete options that are not relevant.

• [ ] 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).
• [x] Documentation update (if none of the other choices apply).

How Has This Been Tested?

Please run npm run build and npm run serve to check if the changes are working as expected. Please include screenshots of the output of both the commands. Add screenshots/gif of the changes if possible.

Checklist:

• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.

New "Not Found" Page

Old "Not Found" Page