Re-write notifications system.

src/notifications/events/message.rs

@@ -0,0 +1,10 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct Create {
+    pub id: String,
+    pub nonce: Option<String>,
+    pub channel: String,
+    pub author: String,
+    pub content: String,
+}