Add section on modifying core block options through various options.

[fabiankaegy]

This came up in slack because of a question on how to remove all alignment options from a core block and how to remove the default wide alignment from the core media & text block.

This would be a good topic for both a reference / guide article and a training lesson.

[pdavies88]

@fabiankaegy I am assuming that this Reference should have an example like one of these snippets correct?

import { addFilter } from '@wordpress/hooks';

function modifyMediaTextBlockOptions(settings, name) {
	if (name !== 'core/media-text') {
		return settings;
	}

	return {
		...settings,
		supports: {
			...settings.supports,
			align: false,
		},
	};
}

addFilter(
	'blocks.registerBlockType',
	'modify-media-text-block-options',
	modifyMediaTextBlockOptions,
);

[fabiankaegy]

@pdavies88 Yes exactly :) With this one we will need to be very explicit about the side effects this can create around block deprecations. So we should test the code examples with existing content already on the page :)