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nixos/gitea: Move to lib.getExe
This makes it so that alternative packages, such as `pkgs.forgejo` are able to be used instead of the default `pkgs.gitea`. Also adds myself as a maintainer of the module. The varible `gitea`, which was used instead of `cfg.package`, has been replaced with the variable `exe`, and is instead the value of the main executable, as gotten from `lib.getExe`. `cfg.package` is used when this value is not appropriate.