chore(platform): add donorbox as funding platform

closes #467

app/Database/Seeds/PlatformSeeder.php

@@ -491,6 +491,13 @@ class PlatformSeeder extends Seeder
                 'home_url'   => 'https://www.ulule.com/',
                 'submit_url' => 'https://www.ulule.com/projects/create/#/',
             ],
+            [
+                'slug'       => 'donorbox',
+                'type'       => 'funding',
+                'label'      => 'Donorbox',
+                'home_url'   => 'https://donorbox.org/',
+                'submit_url' => 'https://donorbox.org/orgs/new',
+            ],
         ];
 
         $socialData = [

app/Resources/icons/funding/donorbox.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M16.455 10.658c0 1.09-.705 2.244-2.098 3.443a13.447 13.447 0 0 1-2.381 1.62 14.102 14.102 0 0 1-2.381-1.629c-1.4-1.2-2.106-2.353-2.106-3.443 0-1.346.887-2.298 2.106-2.298.558 0 .888.054 1.263.238.22.1.412.237.577.403l.541.55.532-.55a2.07 2.07 0 0 1 .586-.421c.366-.166.678-.22 1.254-.22 1.209.018 2.107.988 2.107 2.307Z" clip-rule="evenodd"/>
+  <path d="M22 3.915v16.17A1.911 1.911 0 0 1 20.085 22H3.915A1.911 1.911 0 0 1 2 20.085V3.915C2 2.855 2.854 2 3.915 2h8.066c.267 0 .503.107.68.282a.986.986 0 0 1 .281.68v2.807a.962.962 0 0 1-1.922 0V3.923H4.83a.919.919 0 0 0-.916.916v14.346c0 .51.413.915.916.915h14.346a.914.914 0 0 0 .916-.915V4.839a.942.942 0 0 0-.275-.649s-.214-.206-.48-.252c-.032-.008-.07-.008-.07-.008-.03 0-.061-.007-.09-.007h-2.504a.967.967 0 0 1-.96-.962c0-.526.434-.961.96-.961h3.41A1.907 1.907 0 0 1 22 3.915Z"/>
+</svg>