remove deploy-rs completely

- Remove deploy-rs flake input
- Remove deploy block from flake.nix
- Remove deployChecks from flake checks
- Remove deploy-rs from forgejo-runner hostPackages
- Deployment is now handled by Comin (auto) and nix run .#deploy (manual)

modules/nixos/forgejo-runner/default.nix

@@ -49,7 +49,6 @@ in
           nix
           nodejs
           openssh
-          deploy-rs
         ];
 
         settings = {