[FIX] Lint errors fixed in app directory

[Palanikannan1437]

Closes #175

Issue in brief

Tons of linting errors were present in the app directory

Suggested Fixes/Changes

• Added ESLint config for the app directory
• Fixed all errors and warnings according to next/core-web-vitals
• Fixed unnecessary re-renders by changing the dependencies of useEffect
• Updates nextjs to support next/future/image
• Added react-cookie for better and clear logic
• Formatted the files in the process with the already existing prettier configs

Result of the above Suggested Changes 🎉

[lgtm-com[bot]]

This pull request introduces 1 alert and fixes 2 when merging 9c51e4b16e8d4ebbd083cd1d9cb8597790e6a211 into d7d6311bac18406f6c79cbd174e158433018a24e - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

fixed alerts:

• 2 for Potentially unsafe external link

[Palanikannan1437]

@Sing-Li and @Dnouv, would be awesome if you could review this and let me know if I need to make any changes