♻️(frontend) replace y-webrtc by @hocuspocus

y-webrtc had some issues, users had difficulties
to connect with each others.
We replace it by @hocuspocus/provider.

src/frontend/apps/impress/.env.development

@@ -1,4 +1,4 @@
 NEXT_PUBLIC_API_ORIGIN=http://localhost:8071
-NEXT_PUBLIC_SIGNALING_URL=ws://localhost:4444
+NEXT_PUBLIC_Y_PROVIDER_URL=ws://localhost:4444
 NEXT_PUBLIC_MEDIA_URL=http://localhost:8083
 NEXT_PUBLIC_SW_DEACTIVATED=true