Removed duplicate entry of central-publishing-maven-plugin in parent pom (#138)

Updated documentation for building on Alpine Linux

Signed-off-by: Laurent Klock <Laurent.Klock@arhs-cube.com>

Author: klockla

API/README.md

@@ -82,6 +82,10 @@ The GRPC Java code is now generated automatically with the Protobuf Maven Plugin
 There is no need anymore to download the protoc and protoc-gen-grpc compilers.
 The protocol definition file (urlfrontier.proto) has been moved under src/main/protobuf.
 
+Important note: The version of protoc downloaded from the Maven repository will not run natively on Alpine Linux
+unless you install the gcompat package  which provides glibc compatibility (apk add gcompat).
+
+
 For other languages, you need to generate the code stubs yourself, as shown here for Python
 
 ```

pom.xml

@@ -293,16 +293,6 @@
 							<deploymentName>Crawler-Commons URLFrontier ${project.version}</deploymentName>
 						</configuration>
 					</plugin>
-					<plugin>
-						<groupId>org.sonatype.central</groupId>
-						<artifactId>central-publishing-maven-plugin</artifactId>
-						<version>${central-publishing-plugin.version}</version>
-						<extensions>true</extensions>
-						<configuration>
-							<publishingServerId>central</publishingServerId>
-							<deploymentName>Crawler-Commons URLFrontier ${project.version}</deploymentName>
-						</configuration>
-					</plugin>
 				</plugins>
 			</build>
 		</profile>