Revert "Multiple migration directories"

This reverts commit 2821ca6.

.docs/README.md

@@ -70,7 +70,8 @@ extensions:
 nettrine.migrations:
   table: <string>
   column: <string>
-  directories: <array>
+  directory: <path>
+  namespace: <string>
   versionsOrganization: <null|year|year_and_month>
   customTemplate: <null|path>
 ```
@@ -81,8 +82,7 @@ Minimal configuration:
 
 ```yaml
 nettrine.migrations:
-  directories:
-    App\Migrations: %appDir%/migrations
+  directory: %appDir%/migrations
 ```
 
 

src/DI/MigrationsExtension.php

@@ -34,7 +34,8 @@ public function getConfigSchema(): Schema
 		return Expect::structure([
 			'table' => Expect::string('doctrine_migrations'),
 			'column' => Expect::string('version'),
-			'directories' => Expect::array()->required(),
+			'directory' => Expect::string()->required(),
+			'namespace' => Expect::string('Migrations'),
 			'versionsOrganization' => Expect::anyOf(
 				null,
 				Configuration::VERSIONS_ORGANIZATION_BY_YEAR,
@@ -62,12 +63,9 @@ public function loadConfiguration(): void
 			->setFactory(Configuration::class)
 			->addSetup('setCustomTemplate', [$config->customTemplate])
 			->addSetup('setMetadataStorageConfiguration', [$storage])
+			->addSetup('addMigrationsDirectory', [$config->namespace, $config->directory])
 			->addSetup('setAllOrNothing', [$config->allOrNothing]);
 
-		foreach ($config->directories as $namespace => $directory) {
-			$configuration->addSetup('addMigrationsDirectory', [$namespace, $directory]);
-		}
-
 		if ($config->versionsOrganization === Configuration::VERSIONS_ORGANIZATION_BY_YEAR) {
 			$configuration->addSetup('setMigrationsAreOrganizedByYear');
 		} elseif ($config->versionsOrganization === Configuration::VERSIONS_ORGANIZATION_BY_YEAR_AND_MONTH) {