Remove bundled Redoc HTML file.

Author: 1chz

README.md

@@ -138,12 +138,6 @@ Many developers using JPA tend to use `Long` as the ID type. However, consider w
 ./gradlew build
 ```
 
-### API Documentation
-
-API documentation is available at [api-docs/redoc.html](api-docs/redoc.html), generated using ReDoc in HTML format.
-
-You can also import the [api-docs/openapi.yaml](api-docs/openapi.yaml) file into Postman or Swagger UI to test the API.
-
 ### Run E2E Tests
 
 1. Start the application (**important**)