Erasing unused PRICE_DATA_SERVER from readme

docker/README.md

@@ -365,25 +365,6 @@ Corresponding `docker-compose.yml` overrides:
 
 <br/>
 
-`mempool-config.json`:
-```json
-  "PRICE_DATA_SERVER": {
-    "TOR_URL": "http://wizpriceje6q5tdrxkyiazsgu7irquiqjy2dptezqhrtu7l2qelqktid.onion/getAllMarketPrices",
-    "CLEARNET_URL": "https://price.bisq.wiz.biz/getAllMarketPrices"
-  }
-```
-
-Corresponding `docker-compose.yml` overrides:
-```yaml
-  api:
-    environment:
-      PRICE_DATA_SERVER_TOR_URL: ""
-      PRICE_DATA_SERVER_CLEARNET_URL: ""
-      ...
-```
-
-<br/>
-
 `mempool-config.json`:
 ```json
   "LIGHTNING": {