docs : Update component instructions in next readme.

[Ta5r]

What

• This PR updates components instructions in packages/next Readme docs.

Why

• This PR enhances documentation by providing more information on the component props for better DX for components present in our next package ( The <Parse>, <Image>, <Link> and <Script> components)

Related Issue(s):

• Partly Task: Audit Frontend Documentation

How

Checklist

• I have read the Contribution Guidelines.
• My code is tested to the best of my abilities.
• My code passes all lints (ESLint, tsc, prettier etc.).
• My code has detailed inline documentation.
• I have added unit tests to verify the code works as intended.
• I have updated the project documentation accordingly.

[ayushnirwal]

Almost done. This can be merged after a few minor changes

[justlevine]

Fixed the hierarchy. Will backfill the missing exports in a followup PR.