docs: add Drupal testing email course page

src/pages/atdc.mdx

@@ -0,0 +1,21 @@
+---
+layout: ~/layouts/PageLayout.astro
+title: "Introduction to Automated Testing in Drupal email course"
+---
+
+import AboutMe from "../components/AboutMe.astro"
+import Testimonials from "../components/Testimonials.astro"
+
+Register below for my free upcoming 7-day email course on automated testing in Drupal:
+
+https://forms.gle/9fGwMgaWcWjNDjdAA
+
+<div class="space-y-12">
+  <Testimonials names={[
+    "mike-karthauser",
+    "tawny-bartlett",
+    "scott-euser",
+  ]} />
+
+  <AboutMe />
+</div>

src/products.json

@@ -74,7 +74,7 @@
     "description": "Register for my free upcoming email course on automated testing in Drupal.",
     "link": {
       "text": "Register now",
-      "href": "https://forms.gle/9fGwMgaWcWjNDjdAA"
+      "href": "/atdc"
     }
   },
   {