Remove Grid Autoprefixing

[Antonio-Laguna]

Description of the Change

This removes Autoprefixing Grid by default. Autoprefixer has this option defaulting to false given that not all of grid's features can be safely polyfilled/covered by Autoprefixer behavior.

Given that IE11 is out of support and that, if there's a need authors can manually polyfill as needed, it's most sensible to return this to be false by default as Autoprefixer's warnings create a blocking screen when using Fast Refresh

Fixes #196

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Changelog Entry

• Updated. By default postcss-preset-env won't enable automatic autoprefixing of CSS Grid anymore. This feature produces warnings whenever Grid features can't be polyfilled for IE which collided with Fast Refresh.
  If you need to support IE11 and Grids you can either manually polyfill or re-enable prefixing with the following snippet on your postcss.config.js file:

const baseConfig = require('10up-toolkit/config/postcss.config.js');
const path = require('path');

module.exports = (props) => {
	const config = baseConfig(props);
	config.plugins['postcss-preset-env'].autoprefixer = { grid: true };

	return config;
};

[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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