Updated the Code snippet to use nextjs latest version especially in the lab section.

[0xSigma-dev]

Problem

traditional pages is deprecated in nextjs 13 and latest and may no longer be in use soon. Netxjs documention changes not reflected in scavenger hunt lab Seemed to be no clarity between wallet softwares and wallets as requested in the contributing guide

Summary of Changes

Modified the code snippets to use the latest Nextjs app structure and route nextjs api request and response import from next to next/server. Also sent a PR to update the code for the scavenger hunt app https://github.com/Unboxed-Software/solana-scavenger-hunt-app/pull/2 Changed wallets to wallet apps for clarity changed the application to your application for clarity

Fixes #