Update .env.example

.env.example

@@ -71,4 +71,5 @@ CS_CW_DOMAINS='example.org,example.net,example.com'
 CS_UNLISTED_DOMAINS='example.org,example.net,example.com'
 
 ## Optional 
-HORIZON_DARKMODE=true  # Horizon theme darkmode
+#HORIZON_DARKMODE=false  # Horizon theme darkmode
+#HORIZON_EMBED=false  # Single Docker Container mode