Update title of prav talk.

website/data/schedule.json

@@ -28,7 +28,7 @@
     },
     {
       "time": "18-December-2022 06:00 PM (IST)",
-      "title": "Introducing Prav App project by Ravi Dwivedi",
+      "title": "Introducing Prav app project - A beginning of data freedom movement by a cooperative society by Ravi Dwivedi",
       "url": "https://meet.gnome.org/sof-lml-3y5-8sw",
       "bio": "<a href=\"https://prav.app/\">Prav App</a> is a Free Software powered Instant Messaging app and service based on federated xmpp protocol and managed as a cooperative to replace WhatsApp monopoly."
     },