[Doc] Add more illustrations to the Demos page

Author: fzaninotto

docs/Demos.md

@@ -247,6 +247,20 @@ If you want to see what react-admin is capable of, or if you want to learn from
             </div>
         </div>
     </div>
+    <div class="card">
+        <a href="#broadcom-layer-7-api-hub" class="no-decoration"><img src="https://marmelab.com/static/bcb26e245e6e50e8f13631a156727d2e/46097/API_Hub.png" alt="Developer Portal"></a>
+        <div class="content-card">
+            <a href="#broadcom-layer-7-api-hub" class="no-decoration">
+                <p class="title-card"><b>Developer portal</b></p>
+                <p  class="description-card">Interactive documentation and rights administration for an API gateway</p>
+            </a>
+        </div>
+        <div class="card-footer">
+            <div class="links-container">
+                <p><b><a href="https://github.com/CAAPIM/APIHub" class="source-code link">Source code</a></b></p>
+            </div>
+        </div>
+    </div>
 </div>
 
 ## E-commerce
@@ -433,6 +447,8 @@ The source shows how to implement the following features:
 
 A Team Wiki board built with React-admin Enterprise edition.
 
+[![Team wiki](./img/team-wiki.jpg)](https://marmelab.com/team-wiki/)
+
 * Demo: [https://marmelab.com/team-wiki/](https://marmelab.com/team-wiki/)
 * Source code: [https://github.com/marmelab/team-wiki](https://github.com/marmelab/team-wiki)
 
@@ -452,7 +468,7 @@ The source shows how to implement the following features:
 
 A framework built on top of react-admin for building developer portals.
 
-<div class="iframe-wrapper"><iframe src="https://www.youtube.com/embed/ecHsgNmug9E" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></div>
+[![Broadcom API Hub](https://marmelab.com/static/bcb26e245e6e50e8f13631a156727d2e/46097/API_Hub.png)](https://github.com/CAAPIM/APIHub)
 
 * Source code: [https://github.com/CAAPIM/APIHub](https://github.com/CAAPIM/APIHub)