fix(docs): fix docker monitor icon in project overview

Author: mschoettle

docs/projects/index.md

@@ -79,7 +79,7 @@ In case of an open source project it means that the corresponding repository is
 
 <div class="grid cards" markdown>
 
-* :simple-django:{ .lg .middle } **Docker Monitor**
+* :simple-docker:{ .lg .middle } **Docker Monitor**
 
     ---