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

README.md

@@ -98,6 +98,8 @@ themes/your-theme-name/   # → Root of your Sage based theme
 │   ├── filters.php       # → Theme filters
 │   ├── helpers.php       # → Helper functions
 │   └── setup.php         # → Theme setup
+├── bootstrap/            # → Acorn bootstrap
+│   ├── cache/            # → Acorn cache location (never edit)
 ├── config/               # → Config files
 │   ├── app.php           # → Application configuration
 │   ├── assets.php        # → Asset configuration
@@ -106,17 +108,16 @@ themes/your-theme-name/   # → Root of your Sage based theme
 │   └── view.php          # → View configuration
 ├── composer.json         # → Autoloading for `app/` files
 ├── composer.lock         # → Composer lock file (never edit)
-├── dist/                 # → Built theme assets (never edit)
+├── public/               # → Built theme assets (never edit)
 ├── functions.php         # → Theme bootloader
 ├── index.php             # → Theme template wrapper
 ├── node_modules/         # → Node.js packages (never edit)
 ├── package.json          # → Node.js dependencies and scripts
 ├── resources/            # → Theme assets and templates
-│   ├── assets/           # → Front-end assets
-│   │   ├── fonts/        # → Theme fonts
-│   │   ├── images/       # → Theme images
-│   │   ├── scripts/      # → Theme javascript
-│   │   └── styles/       # → Theme stylesheets
+│   ├── fonts/            # → Theme fonts
+│   ├── images/           # → Theme images
+│   ├── js/               # → Theme javascript
+│   ├── css/              # → Theme stylesheets
 │   └── views/            # → Theme templates
 │       ├── components/   # → Component templates
 │       ├── form/         # → Form templates