Add 404 Page

[hackthetunnelsbot]

Description:

Checkout: client/src/main.tsx to see how to route your own 404 page.

Create and export a new 404 page component from the client/src/pages folder.

Add the text "404: Not Found" and a funny gif of your choice to the page.

Acceptance Criteria:

When navigating to a missing route, you should see the "404: Not Found" text and some gif.

[Saumy-m]

!review