hosts: add PW05CH3L

Add a NixOS module for the PW05CH3L host, and start to separate `pc` and
`workstation` as a lot of `flake.modules.nixos.pc` isn't needed in WSL.

This probably won't be the final implementation, but it works for now.

modules2/nixos-configurations.nix

@@ -61,7 +61,10 @@
           modules = [ config.flake.modules.nixos."hosts/${hostname}" ];
         };
 
-        PW05CH3L = mkNixosConfiguration { hostname = "PW05CH3L"; };
+        PW05CH3L = mkNixosConfiguration rec {
+          hostname = "PW05CH3L";
+          modules = [ config.flake.modules.nixos."hosts/${hostname}" ];
+        };
       };
     };
 }