Issue-15/Feat/Dynamic routes for single challenges

[codeTrackLift]

# Description Issue: #15 - [x] Add dynamic routes for single challenges - Adding the following dynamic route `/challenges/[challenge]` for a single challenge - `[challenge]` will be accessible in the app as `params.challenge` - We can use this to determine which single challenge to render # Screenshots

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# Notes [Next.js docs on dynamic routes](https://nextjs.org/docs/app/building-your-application/routing/dynamic-routes)