Clean up list of projects to: 1. hide OONI projects for now and 2. move successfully completed projects to "Past projects" section

The tool for auto upgrade is changed from `yum-cron` to `dnf-automatic` in RHEL 8/ CentOS 8/ Fedora22.

A session on how to setup `dnf-automatic` in RHEL 8/ CentOS 8 is added, which is based on https://fedoraproject.org/wiki/AutoUpdates#Fedora_22_or_later_versions

1. Reformat the config
    No leading spaces in the config provided
2. Fix an error in the *automatically reboot* session
    Updating `/etc/apt/apt.conf.d/20auto-upgrades` should be another step, not part of the `/etc/apt/apt.conf.d/50unattended-upgrades`. In Ubuntu 20.04, the `/etc/apt/apt.conf.d/20auto-upgrades` is already created, we can update it without recreating it.

(9 9.9.9.9) → (9.9.9.9)

Roger Dingledine authored 4 years ago and Philipp Winter committed 4 years ago

In its current location, the paragraph implies that you need
to turn off NoNewPrivileges in order to run obfsproxy on any port,
and I think you only need to run it if you're using a low port.