[Feature]: Adding personal PAGE NOT FOUND page

[raghavawasthi24]

For sections like about, contact, projects, there is Next.js default page, so instead we can build our separate PageNotFound page.

[amjido-01]

i can work on this under gssoc`24, assign me and add the level for the issue

[Aryainguz]

Go ahead @raghavawasthi24