feat: add GuideJar embed support in HC (#13944)

config/markdown_embeds.yml

@@ -134,6 +134,18 @@ codepen:
       </iframe>
     </div>
 
+guidejar:
+  regex: 'https?://(?:www\.)?guidejar\.com/(?:embed|guides)/(?<guide_id>[^&/?]+)'
+  template: |
+    <div style="position: relative; padding-bottom: 62.5%; height: 0;">
+      <iframe
+        src="https://www.guidejar.com/embed/%{guide_id}?type=1&controls=on"
+        frameborder="0"
+        allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+        allowfullscreen
+        style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;"></iframe>
+    </div>
+
 github_gist:
   regex: 'https?://gist\.github\.com/(?<username>[^/]+)/(?<gist_id>[a-f0-9]+)'
   template: |