Finish first draft of all helper pages

docs/helpers/database.md

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+# Database Helpers
+
+The database helpers provide a more generic way of handling with the database in comparision to the other helper methods.
+
+## deleteEntities
+The `deleteEntities` method allows a fixture to delete all entities which match a given criteria. It takes the entity name and criteria as parameter and deletes all found entities.
+
+```php
+<?php
+
+class MyFixture extends Fixture {
+    public function load(): void {
+        $this->helper->Database()->deleteEntities( // [!code focus]
+            entity: ProductDefinition::ENTITY_NAME, // [!code focus]
+            criteria: (new Criteria())->addFilter(new EqualsFilter('name', 'Example')) // [!code focus]
+        ); // [!code focus]
+    }
+}
+```
+
+This example would remove all products which have the name: "Example".