Remove obsolete mailing lists.

These lists are used to generate a page in the static site generation
(Project information).

pom.xml

@@ -133,29 +133,6 @@
       <system>Gitlab</system>
       <url>https://gitlab.orekit.org/orekit/rugged/issues</url>
   </issueManagement>
-  
-  <mailingLists>
-    <mailingList>
-      <name>Shared Orekit/Rugged announces mailing list</name>
-      <subscribe>https://www.orekit.org/wws/subscribe/orekit-announces</subscribe>
-      <unsubscribe>https://www.orekit.org/wws/signoff/orekit-announces</unsubscribe>
-      <archive>https://www.orekit.org/wws/arc/orekit-announces</archive>
-    </mailingList>
-    <mailingList>
-      <name>Rugged users mailing list</name>
-      <subscribe>https://www.orekit.org/wws/subscribe/rugged-users</subscribe>
-      <unsubscribe>https://www.orekit.org/wws/signoff/rugged-users</unsubscribe>
-      <post>rugged-users@orekit.org</post>
-      <archive>https://www.orekit.org/wws/arc/rugged-users</archive>
-    </mailingList>
-    <mailingList>
-      <name>Rugged developers mailing list</name>
-      <subscribe>https://www.orekit.org/wws/subscribe/rugged-developers</subscribe>
-      <unsubscribe>https://www.orekit.org/wws/signoff/rugged-developers</unsubscribe>
-      <post>rugged-developers@orekit.org</post>
-      <archive>https://www.orekit.org/wws/arc/rugged-developers</archive>
-    </mailingList>
-  </mailingLists>
 
   <distributionManagement>
     <site>