Revert "Add optional WebTransport frame transport"

This reverts commit 3e2ca8057b.

docker-compose-example.yml

@@ -6,8 +6,6 @@ services:
     restart: unless-stopped
     ports:
       - "3000:3000"
-      # Uncomment to try WebTransport frame delivery over QUIC/UDP.
-      # - "3001:3001/udp"
     environment:
       PORT: "3000"
       NODE_ENV: production
@@ -33,10 +31,6 @@ services:
       MAX_WS_BUFFER_BYTES: "2097152"
       MAX_AUDIO_QUEUE_BYTES: "4194304"
       MAX_RELAY_BRANCH_QUEUE_BYTES: "8388608"
-      # websocket: default. webtransport: try QUIC frames first. auto: try QUIC when available, fall back to WebSocket.
-      FRAME_TRANSPORT: websocket
-      WEBTRANSPORT_PORT: "3001"
-      WEBTRANSPORT_PUBLIC_PORT: "3001"
       RECENT_URLS_PATH: /app/data/recent-urls.json
       FAVORITES_PATH: /app/data/favorites.json
       # Set this and mount a host directory below to enable Play Local.