Remove readme doc for now since it won't be in core for a while.

packages/style-engine/README.md

@@ -36,7 +36,6 @@ _Parameters_
     -   _context_ `string` An identifier describing the origin of the style object, e.g., 'block-supports' or 'global-styles'. Default is 'block-supports'. When both `context` and `selector` are set, the Style Engine will store the CSS rules using the `context` as a key.
     -   _convert_vars_to_classnames_ `boolean` Whether to skip converting CSS var:? values to var( --wp--preset--\* ) values. Default is `false`.
     -   _selector_ `string` When a selector is passed, `generate()` will return a full CSS rule `$selector { ...rules }`, otherwise a concatenated string of properties and values.
-    -   _metadata_ `array` An associate array in the format of WP_Style_Engine::BLOCK_STYLE_DEFINITIONS_METADATA that extends the latter.
 
 _Returns_
 `array<string|array>|null`
@@ -88,43 +87,6 @@ array(
 */
 ```
 
-The default block style support definitions can be extended by passing metadata in the options.
-
-```php
-$block_attributes =  array(
-     'style' => array(
-        'layout' => array( 'float' => 'left' ),
-     ),
-);
-
-$styles = wp_style_engine_get_styles(
-    $block_attributes['style'],
-    array(
-        'selector' => '.a-selector',
-        'metadata' => array(
-			'layout' => array(
-				'float' => array(
-					'property_keys' => array(
-						'default' => 'float',
-					),
-					'path'          => array( 'layout', 'float' ),
-				),
-			),
-		)
-    )
-);
-print_r( $styles );
-
-/*
-array(
-    'css'          => '.a-selector{float:left}'
-    'declarations' => array( 'float' => 'left' )
-)
-*/
-```
-
-Note: CSS properties must be supported by [safecss_filter_attr](https://developer.wordpress.org/reference/functions/safecss_filter_attr/), otherwise you can allow non-supported CSS using the filter [safecss_filter_attr_allow_css](https://developer.wordpress.org/reference/hooks/safecss_filter_attr_allow_css/).
-
 ### wp_style_engine_get_stylesheet_from_css_rules()
 
 Use this function to compile and return a stylesheet for any CSS rules. The Style Engine will automatically merge declarations and combine selectors.