Push deployer configuration out of autoconfig

It tends to pop back into function apps where it is not needed
otherwise. Users that want to use the library need to import
the FunctionConfiguration directly using the
@EnableFunctionDeployer convenience annotation..

spring-cloud-function-deployer/README.md

@@ -2,6 +2,7 @@ Spring Cloud Function Deployer is an library for building apps that can deploy f
 
 ```java
 @SpringBootApplication
+@EnableFunctionDeployer
 public class FunctionApplication {
 
 	public static void main(String[] args) throws IOException {