Housekeeping (#2520)

* enhance(project): Add .prettierrc to project
* chore(deps): Bump dependencies
* chore(view): Improve readability of the search form view
* chore(admin): Improve language used in the customize_register filter docblock
* chore(lint): Lint project assets
* chore(change-log): Improve/prepare the changelog for actual release
* chore(readme): Improve README feature list
* chore(readme): Update README theme directory structure
* chore(readme): Add GitHub sponsors badge
* chore(readme): Clean up various wording
* fix(ci): Fix failing tests
* fix(mix): Add index.php to purgecss scope (Supersedes #2423) (Credit @oxyc)

resources/assets/scripts/editor.js

@@ -1,9 +1,6 @@
 import '@wordpress/edit-post';
 import domReady from '@wordpress/dom-ready';
-import {
-  unregisterBlockStyle,
-  registerBlockStyle,
-} from '@wordpress/blocks';
+import { unregisterBlockStyle, registerBlockStyle } from '@wordpress/blocks';
 
 domReady(() => {
   unregisterBlockStyle('core/button', 'outline');