update readme

README.md

@@ -101,10 +101,6 @@ def start_ingestion_task(file_content: str, file_name: str) -> dict:
 # 3. Query a List Of L1/L2 Fits-Files By Metadata Values
 Query for file info by metadata values.
 
-## Configuration
-The helper will send HTTP requests to an external API. The external api url is set to working default values. It can be overwritten if needed via env variable, e.g.
-CSST_BACKEND_API_URL=http://10.200.60.199:9010
-
 ## Function: `query_metadata`
 ```python
 def query_metadata(
@@ -183,10 +179,6 @@ filter = {
 # 4. Query a L2 Processing Tasks State
 Query the processing state of a processing task given a L2 task id.
 
-## Configuration
-The helper will send HTTP requests to an external API. The external api url is set to working default values. It can be overwritten if needed via env variable, e.g.
-CSST_BACKEND_API_URL=http://10.200.60.199:9010
-
 ## Function: `query_task_state`
 ```python
 def query_task_state(
@@ -210,10 +202,6 @@ def query_task_state(
 # 5. Query a Star Catalog
 Query a star catalog by column values given a ra, dec and radius preselection.
 
-## Configuration
-The helper will send HTTP requests to an external API. The external api url is set to working default values. It can be overwritten if needed via env variable, e.g.
-CSST_BACKEND_API_URL=http://10.200.60.199:9010
-
 ## Function: `query_star_catalog`
 ```python
 def query_star_catalog(