Document installing from Fedora RPM
It is possible to avoid Flatpak and copy the site-packages and main biary from Fedora RPM even on Ubuntu: https://www.rpmfind.net/linux/RPM/fedora/devel/rawhide/x86_64/g/gnome-feeds-0.12-1.fc32.noarch.html
Could you please mention it in the docs? It may help people to try gfeeds without downloading a Gigabyte of data in order to run dozens kilobytes of Python code.