Remove Support section from README.org

The forum has been taken down years ago and the links to the mailing
lists on R-forge are not very useful anymore either.

README.org

@@ -12,14 +12,6 @@
 ** Installation
    Please see the =INSTALL= file in the =doc= directory for more
    information on how to install ProbABEL.
-** Support
-   For end-user support to ProbABEL please have a look at our forum at
-   http://forum.genabel.org. If you'd like to be kept up-to-date with
-   the latest releases of the tools in the GenABEL suite, please
-   subscribe to the =genabel-announce= mailing list [[https://r-forge.r-project.org/mail/?group_id=505][here]].
-
-   (Potential) Developers are encouraged to sign up for [[https://r-forge.r-project.org/mail/?group_id=505][the
-   =genabel-devel= mailing list on R-forge]].
 ** Licence
    ProbABEL is licensed under the GNU Public Licence v2 or later.