Location to provide flatpaks to the Librem 5 community

'https://store.pureos.net' to serve built flatpaks to Librem 5 users.

• Interim flatpak repo set up on 45.33.86.90 under /srv/repo/pureos

• relies on pureos runtime availability -or- patched GNOME runtime
• this issue refers to a flatpak repository that will hold flatpaks and associated runtime(s)
• eventually to be integrated into Laniakea