Escape double quotes (which broke github action builds)

Author: Songtech-0912

site_collections/_features/extensibility.html

@@ -35,10 +35,10 @@
    title="PyPlugs"
    img="https://picsum.photos/1280/720"
    img_alt=""
-   justify="right"
    detail="
-    User-created custom nodes can be created visually within Natron by grouping existing nodes and exported with the "PyPlug" exporter.
-    
+    User-created custom nodes can be created visually within Natron by grouping existing nodes and exported with the \"PyPlug\" exporter.
+    <br />
+    <br />
     Various tools created by the commuity can be found in [Natron's community plugins repository](https://github.com/NatronGitHub/natron-plugins) on GitHub."
 %}