README: update nixos link to official wiki url

yvt / openspades

Compatible client of Ace of Spades 0.75

http://openspades.yvt.jp/

GNU General Public License v3.0

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Closed makefu closed 5 months ago

makefu commented 5 months ago

This commit updates the the link from the former, unofficial nixos wiki page to the new https://wiki.nixos.org/

ref: NixOS/foundation#113