fix: set default LLM and update browser settings in .env.example

Author: dhavalDev123

.env.example

@@ -34,6 +34,9 @@ IBM_ENDPOINT=https://us-south.ml.cloud.ibm.com
 IBM_API_KEY=
 IBM_PROJECT_ID=
 
+#set default LLM
+DEFAULT_LLM=openai
+
 # Set to false to disable anonymized telemetry
 ANONYMIZED_TELEMETRY=false
 
@@ -47,6 +50,7 @@ BROWSER_DEBUGGING_PORT=9222
 BROWSER_DEBUGGING_HOST=localhost
 # Set to true to keep browser open between AI tasks
 KEEP_BROWSER_OPEN=true
+USE_OWN_BROWSER=false
 BROWSER_CDP=
 # Display settings
 # Format: WIDTHxHEIGHTxDEPTH