chore: udpate sample-config

sample.config.yaml

@@ -3,8 +3,8 @@ server:
   port: 8080
 
 db:
-  user: "your_db_user"
-  pass: "your_db_password"
+  user: "postgres"
+  pass: "postgres"
   host: "localhost"
   port: 5432
   db_name: "dezone"
@@ -16,5 +16,8 @@ redis:
 
 jwt:
   token_exp_minutes: 60
-  refresh_token_exp_minutes: 10080  # 7 days
-  token_secret: "your_jwt_secret_key_here"
+  refresh_token_exp_minutes: 10080 
+  token_secret: "Secret"
+
+RPC:
+  url: "exmaple.com"