fixes #127 - add notfound page

[DharshiBalasubramaniyam]

Hi @mohitparmar1 sir, fixed the issue #127

The result is as below.

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Name	Status	Preview	Comments	Updated (UTC)
shopy-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 14, 2024 2:55pm

[DharshiBalasubramaniyam]

@mohitparmar1 can you please add gssoc and level labels to this pr