Use pungi-fedora config files for release information

[Sanqui]

e.g. https://pagure.io/fork/mohanboddu/pungi-fedora/blob/python-classroom-lab/f/fedora.conf

[Sanqui]

Build information (for compose) may be found here: https://pagure.io/pungi-fedora/blob/master/f/fedora.conf

ISOs can be found on these two places:

• Workstation, spins, etc.: https://download.fedoraproject.org/
• Labs and cloud only: https://download.fedoraproject.org/pub/alt/

These URLs redirect to local mirrors, which may have varying directory listings.

Available releases and their descriptions are found on the various websites:

• https://getfedora.org/
• https://spins.fedoraproject.org/
• https://labs.fedoraproject.org/

These websites are static and their source is on pagure (e.g. for spins: https://pagure.io/fedora-websites/blob/master/f/spins.fedoraproject.org/data/content/index.html)

The path ahead here is to

• Parametrize the release information on the websites, so it's grabbed from json or yaml
• Make a fedora-release-info Python script or module which sources pungi and the website information for current release data and info

[Sanqui]

Related fedora-websites issue: https://pagure.io/fedora-websites/issue/673