docs: backfill next readme with getGlobalStyles() and getTemplateData()

[Pathan-Amaankhan]

What

• This PR adds a doc describing how global styles and queried template data can be mutated/updated.

Related Issue(s):

~ https://github.com/rtCamp/headless/issues/314~

Screenshots

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.

[justlevine]

#20 (review)

(It's possible the change is relocating this into one of the README.md references, but it's has nothing to do with explaining how a user can fetch custom data in their app).

[SH4LIN]

#20 (review)

[justlevine]

Tl;dr from today's sync.

Move this into the respective package README.md and it can be merged.

Then we'll follow up in a separate PR with a .md on how to query wordpress data from within the WP app.

[changeset-bot]

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[Pathan-Amaankhan]

Hi @justlevine,
Have migrated the docs in e519aeb & 40fb888. Can you please re-review the PR.