Dependencies related to mock server removed and README updated

Author: Guzel738

kafka-ui-react-app/README.md

@@ -20,17 +20,12 @@ Set correct URL to your API server in `.env`.
 ```
 REACT_APP_API_URL=http://api.your-kafka-rest-api.com:3004
 ```
-If you plan to use full fake REST API you have to update `.env`.
-```
-REACT_APP_API_URL=http://localhost:3004
-```
 Start application
 ```
 npm start
 ```
 
 ## Links
 
-* [JSON Server](https://github.com/typicode/json-server) - Fake REST API.
 * [Bulma](https://bulma.io/documentation/) - free, open source CSS framework based on Flexbox
 * [Create React App](https://github.com/facebook/create-react-app)