Update logo to support dark/light theme (#569)

* Update logo.svg

* Update README.md

README.md

@@ -1,18 +1,10 @@
-<p align="center"><img src="/art/logo.svg" alt="Logo Laravel Fortify"></p>
+<p align="center"><img width="358" height="66" src="/art/logo.svg" alt="Logo Laravel Fortify"></p>
 
 <p align="center">
-    <a href="https://github.com/laravel/fortify/actions">
-        <img src="https://github.com/laravel/fortify/workflows/tests/badge.svg" alt="Build Status">
-    </a>
-    <a href="https://packagist.org/packages/laravel/fortify">
-        <img src="https://img.shields.io/packagist/dt/laravel/fortify" alt="Total Downloads">
-    </a>
-    <a href="https://packagist.org/packages/laravel/fortify">
-        <img src="https://img.shields.io/packagist/v/laravel/fortify" alt="Latest Stable Version">
-    </a>
-    <a href="https://packagist.org/packages/laravel/fortify">
-        <img src="https://img.shields.io/packagist/l/laravel/fortify" alt="License">
-    </a>
+<a href="https://github.com/laravel/fortify/actions"><img src="https://github.com/laravel/fortify/workflows/tests/badge.svg" alt="Build Status"></a>
+<a href="https://packagist.org/packages/laravel/fortify"><img src="https://img.shields.io/packagist/dt/laravel/fortify" alt="Total Downloads"></a>
+<a href="https://packagist.org/packages/laravel/fortify"><img src="https://img.shields.io/packagist/v/laravel/fortify" alt="Latest Stable Version"></a>
+<a href="https://packagist.org/packages/laravel/fortify"><img src="https://img.shields.io/packagist/l/laravel/fortify" alt="License"></a>
 </p>
 
 ## Introduction