For livekit user
For those who is used to livekit.io just open .env file and fill your keys to it.
LIVEKIT_API_KEY=
LIVEKIT_API_SECRET=
NEXT_PUBLIC_LIVEKIT_URL=
For newbie
Livekit require you to configure Client and Server before using it.
Sign in to Livekit and go to projects you'll see the above guide. Now, see Configure Client setion and select React as client. It'll redirect you to Quickstart document.
Copy serverUrl to NEXT_PUBLIC_LIVEKIT_URL and leave the token variable. Next, go to Generating tokens for clients and copy the remain keys.
Paste these to .env file and restart the app.