docs: explain that you have to use a `babel.config.js` for Yarn PnP

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Commits
Files that changed from the base of the PR and between 85e012c315d8320fc0f082947fa0760261f594de and cff811cb5be1f83f24f7bc5750ee75d1c0ce40b9.

Walkthrough

The recent changes enhance documentation for configuring Babel with Yarn PnP in a project using Shakapacker. This includes a new note in the README.md, a basic configuration skeleton in customizing_babel_config.md, and improved instructions for React support. No alterations were made to the declarations of exported or public entities.

Changes

Files	Change Summary
CHANGELOG.md	Improved documentation for using Yarn PnP in the project.
README.md	Added a note about configuring Babel with Yarn PnP using a `babel.config.js` file and a reference to customization examples.
docs/customizing_babel_config.md	Added a basic configuration skeleton with Shakapacker preset, customization for presets and plugins, and React support setup.

Assessment against linked issues

Objective	Addressed	Explanation
Out of the box support for Yarn Berry + PnP as nodelinker (#482)	✅
Default configuration not working with Yarn Berry + PnP, need for documentation update (#482)	✅

In a warren deep, with code so neat, A rabbit wrote, with joyful beat. Yarn Berry, PnP aligned, Shakapacker's path defined. Now Babel sings, in harmony sweet, With React support, the circle's complete.

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shakacode / shakapacker