Revert "Move pages, remove the page content type"

This reverts commit e4a779fc45.

source/_pages/atdc.md

@@ -0,0 +1,27 @@
+---
+title: Introduction to Automated Testing in Drupal email course
+---
+
+{% block content %}
+
+Do you want to learn how to write automated tests and do test-driven development in Drupal?
+
+Register below for my free 10-day email course, where you'll learn to write a new Drupal module from scratch with automated tests.
+
+Learn to test things like:
+
+* Whether pages exist.
+* Whether users can view specific pages based on their permissions.
+* Whether certain content is visible on a page given particular circumstances.
+* Refactoring code to test dedicated classes such as Services, Repositories, Builders and Actions.
+
+{% include 'email-course-form.html.twig' %}
+{% endblock %}
+
+{% block content_bottom %}
+  <div class="space-y-12">
+    {% include 'testimonials' with { tag: 'atdc' } %}
+
+    {{ parent() }}
+  </div>
+{% endblock %}