Add Substra space and blog

app.py

@@ -194,6 +194,10 @@ consentful = Category(
     - Avoiding extractive, chauvinist, ["dark"](https://www.deceptive.design), and otherwise "unethical" patterns of engagement.
     """,
     news=[
+        News(
+            title="Creating Privacy Preserving AI with Substra",
+            link="https://huggingface.co/blog/owkin-substra"
+        ),
         News(
             title="🎥 MoroccoAI webinar - Loubna Ben Allal - 'Building open large models for code'",
             link="https://twitter.com/MoroccoAI/status/1629105224848646144"
@@ -204,6 +208,10 @@ consentful = Category(
         )
     ],
     spaces=[
+        Space(
+            title="Federated Learning with Substra",
+            id="owkin/substra"
+        ),
         Space(
             title="Does CLIP Know My Face?",
             id="AIML-TUDA/does-clip-know-my-face"