Move more release topics under Releases category

[danbst]

https://discourse.nixos.org/t/nixos-19-09-release

NixOS 19.03 release

[19.03 Koi] Hi everyone! I’m happy to announce our new stable channel, NixOS 19.03 “Koi”! Release notes Upgrade instructions Image downloads While I have the honour of being the one to sign the tag and post the release announcement, I’m far from being the only contributor — in fact, across a total of over 20,000 commits since 18.09, I only played a part in 86 of them! The rest was covered by 885 other contributors (67 more than for 18.09, let’s keep that growth going!). The following commit…

NixOS 18.09 Jellyfish: released

Hi community! I’m happy to announce that on September 36th,^W 18.09 “Jellyfish” has hit stable! As with previous releases, x86_64-linux and x86_64-darwin are the main focus of the community, and the main supported platforms, but the aarch64-linux platform is in pretty good shape I’d say. Since 18.03 there over 21k commits! (16k when removing merge commits). The contributors sure are working hard! 819 commit authors for this release! Thanks to all of you for the hard work! Please, see the rele…

[garbas]

done. thank you for noticing.