feat(assets): Change default CSS framework to Tailwind

* enhance(view): Add light default styling for Tailwind
* chore(view): Clean up unnecessary selectors and spacing
* feat(acorn): Update Acorn for Laravel 8.x
* chore(acorn): Create default `bootstrap/` project directory for Laravel 8.x
* refactor(acorn): Split the Acorn bootloader between `functions.php` and `bootstrap/app.php` to coincide with Laravel
* refactor(assets): Lighten the out of the box CSS boilerplate
* refactor(assets): Rename `dist/` to `public/` to coincide with Laravel
* refactor(assets): Flatten the `assets/` directory into `resources/` to coincide with Laravel
* refactor(assets): Rename `scripts/` to `js/` to coincide with Laravel
* refactor(assets): Rename `styles/` to `css/` to coincide with Laravel
* feat(deps): Update to Laravel Mix ^6.0
* chore(deps): Change Mix-related package.json `scripts` to the new `mix` binary
* chore(deps): Remove PurgeCSS in favor of Tailwind's built in purge
* chore(deps): Remove deprecated/unnecessary/unused dependencies
* chore(deps): Bump minimum PHP version to 7.3 to coincide with Laravel 8.x

resources/js/app.js

@@ -0,0 +1,8 @@
+/**
+ * External Dependencies
+ */
+import 'jquery';
+
+$(document).ready(() => {
+  // console.log('Hello world');
+});