fix: update sensitive information in .env.example for better security

Author: PriyanshuPz

self-host/.env.example

@@ -5,14 +5,14 @@ DATABASE_URL=postgresql://mindsdb:mindsdb@kbnet_database:5432/mindsdb
 NEXT_PUBLIC_SERVER_URL=http://kbnet_server:8000
 NEXT_PUBLIC_WS_SERVER_URL=ws://kbnet_server:8000
 
-BETTER_AUTH_SECRET=ZqjXF3fPMkwfiIXAIGsVVl52MyMwJ2G7
+BETTER_AUTH_SECRET=auth_secret_token
 BETTER_AUTH_URL=http://localhost:3000
 
 NEXT_PUBLIC_DISABLE_ANONYMOUS_AUTH=false
 NEXT_PUBLIC_SELF_HOSTED=true
 
 ENCRYPTION_KEY_1=codeitrightwayokidiot
-GEMINI_API_KEY=AIzaSyDvGQm8wITYzDmEixP7-1hJzBWgAOyAlJ8
+GEMINI_API_KEY=AIza...
 
 MINDSDB_HOST=http://kbnet_mindsdb:47334
 MINDSDB_USERNAME=mindsdb