Revert "upgrade to fedora 31 (#128)"
Revert "upgrade to fedora 31 (#128)"

This reverts commit 5cf564b7974d16a55fbfd1e5c10bf0b6758d2646.

droolsjbpm/jbpm-website,droolsjbpm/jbpm-website,droolsjbpm/jbpm-website,droolsjbpm/jbpm-website