remove default redis configuration (#582)

### What problem does this PR solve?
#580 
### Type of change

- [x] Refactoring

conf/service_conf.yaml

@@ -13,10 +13,6 @@ minio:
   user: 'rag_flow'
   password: 'infini_rag_flow'
   host: 'minio:9000'
-redis:
-  db: 1
-  password: 'infini_rag_flow'
-  host: 'redis:6379'
 es:
   hosts: 'http://es01:9200'
 user_default_llm:

docker/service_conf.yaml

@@ -13,10 +13,6 @@ minio:
   user: 'rag_flow'
   password: 'infini_rag_flow'
   host: 'minio:9000'
-redis:
-  db: 1
-  password: 'infini_rag_flow'
-  host: 'redis:6379'
 es:
   hosts: 'http://es01:9200'
 user_default_llm: