Attempt to copy javadocs

Author: dsyer

spring-grpc-docs/src/main/antora/antora.yml

@@ -9,4 +9,8 @@ ext:
         command: mvnw package -P javadoc -DskipTests
         local: true
       scan:
-        dir: spring-grpc-docs/target/classes/antora-resources
+        - dir: spring-grpc-docs/target/classes/antora-resources
+        - dir: target/site/apidocs
+          into:
+            name: api
+            dir: modules/ROOT/pages/api