Remove references to pgfoundry as recommended hosting platform
Remove references to pgfoundry as recommended hosting platform

pgfoundry is deprectaed and no longer accepting new projects,
so we really shouldn't be directing people there.

xinzweb/gpdb,ashwinstar/gpdb,yazun/postgres-xl,lisakowen/gpdb,ashwinstar/gpdb,xinzweb/gpdb,ovr/postgres-xl,lisakowen/gpdb,xinzweb/gpdb,yazun/postgres-xl,greenplum-db/gpdb,greenplum-db/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,lisakowen/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,50wu/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,adam8157/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,jmcatamney/gpdb,Postgres-XL/Postgres-XL,ovr/postgres-xl,50wu/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,pavanvd/postgres-xl,adam8157/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,adam8157/gpdb,50wu/gpdb,adam8157/gpdb,adam8157/gpdb,ovr/postgres-xl,50wu/gpdb,jmcatamney/gpdb,ovr/postgres-xl,oberstet/postgres-xl,pavanvd/postgres-xl,jmcatamney/gpdb,oberstet/postgres-xl,xinzweb/gpdb,50wu/gpdb,techdragon/Postgres-XL,adam8157/gpdb,techdragon/Postgres-XL,lisakowen/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,oberstet/postgres-xl,lisakowen/gpdb,zeroae/postgres-xl,yazun/postgres-xl,50wu/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,ovr/postgres-xl,adam8157/gpdb,zeroae/postgres-xl,xinzweb/gpdb,techdragon/Postgres-XL,oberstet/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,pavanvd/postgres-xl,zeroae/postgres-xl,xinzweb/gpdb,lisakowen/gpdb,lisakowen/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,xinzweb/gpdb,yazun/postgres-xl,yazun/postgres-xl,xinzweb/gpdb,adam8157/gpdb