docs: simplify Docker commands in README and enhance logging in WebRTC stats exporter

webrtc-internals-exporter/override.js

@@ -92,10 +92,12 @@ class WebrtcInternalExporter {
     window.postMessage(
       {
         event: "webrtc-internal-exporter:peer-connection-stats",
-        stats
+        stats: [stats]
       },
-      stats
+      [stats]
     );
+
+    log(`Single stat collected:`, [stats]);
   }
 
   async collectAllStats() {
@@ -112,11 +114,12 @@ class WebrtcInternalExporter {
     window.postMessage(
       {
         event: "webrtc-internal-exporter:peer-connections-stats",
-        data: JSON.parse(JSON.stringify(stats)),
+        data: stats
       },
+      stats
     );
 
-    log(`Stats collected:`, JSON.parse(JSON.stringify(stats)));
+    log(`Stats collected:`, stats);
 
     setTimeout(this.collectAllStats.bind(this), this.updateInterval);
     return stats;