Move all layout files to a "v1" directory.

resources/views/v1/emails/oauth-client-created-text.twig

@@ -0,0 +1,9 @@
+{% include 'emails.header-text' %}
+Somebody (hopefully you) just created a new Firefly III API OAuth Client for your user account. It's labeled "{{ client.name }}" and has callback URL:
+
+{{ client.redirect }}
+
+With this client, they can access <strong>all</strong> of your financial records through the Firefly III API.
+
+If this wasn't you, please revoke this client as soon as possible at {{ route('profile.index') }}.
+{% include 'emails.footer-text' %}