hades: switch from gitea to forgejo #470

Job	Run time
Flake check	1m 29s
Format check	23s
Nix packages (ansel)	27s
Nix packages (grafanaDashboards/nginx)	21s
Nix packages (grafanaDashboards/node-exporter)	21s
Nix packages (kaleidoscope-udev-rules)	17s
Nix packages (sddm-sugar-candy)	18s
Nix packages (spot)	19s
NixOS configs (boreal)	4m 2s
NixOS configs (hades)	2m 41s
NixOS configs (hephaestus)	4m 26s
NixOS configs (talos)	4m 10s
NixOS configs (thanatos)	1m 34s
	20m 48s

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