feat: upgrade font-awesome to v7

mentions-legales.php.sample

@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Mentions Légales - kaubuntu.re</title>
     <link rel="stylesheet" href="css/styles.css">
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.1/css/all.min.css">
 
     <!-- Favicons -->
     <link rel="apple-touch-icon" sizes="180x180" href="img/apple-touch-icon.png">