Organize Docker environment examples

docker-compose/.env.remote.example

@@ -1,11 +1,13 @@
-# Shared application settings
+# Container image
 PULSE_SIGNAGE_PLAYER_IMAGE="git.lzstealth.com/lzstealth/pulse-signage-player:latest"
+
+# Shared security
 PULSE_SIGNAGE_SHARED_SECRET=""
 
-# Player settings
+# Remote player
 PLAYER_IDENTIFIER="player-remote"
 PLAYER_PUBLIC_URL="http://localhost:8081"
 PLAYER_AGENT_RECONNECT_DELAY_MS=5000
 
-# Remote player connectivity settings
+# Remote bridge connectivity
 BRIDGE_PUBLIC_URL="http://player-bridge.example.com:8090"