Host images locally

We don’t need the complexity of S3. Sepcifically the complexity of
managing my own AWS account, flysystem made the Laravel side easy.

A command is added to copy the the S3 files over to local storage.

tests/TestCase.php

@@ -7,4 +7,13 @@ use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
 abstract class TestCase extends BaseTestCase
 {
     use CreatesApplication;
+
+    public function removeDirIfEmpty(string $dir): void
+    {
+        // scandir() will always return `.` and `..` so even an “empty”
+        // directory will have a count of 2
+        if (is_dir($dir) && count(scandir($dir)) === 2) {
+            rmdir($dir);
+        }
+    }
 }