run nix-shell with fish and set name in starship

modules/shell/nixpkgs.nix

@@ -4,7 +4,7 @@
     programs.fish = {
       shellAbbrs = {
         n = "nix";
-        ns = "nix-shell -p";
+        ns = "nix-shell --run fish -p";
         nsr = "nix-shell-run";
         nps = "nix repl '<nixpkgs>'";
         nixo = "man configuration.nix";

modules/shell/starship.nix

@@ -48,7 +48,7 @@
         style = "red";
       };
       nix_shell = {
-        format = "[$symbol]($style)";
+        format = "[$symbol $name]($style)";
         symbol = "❄️";
       };
       python = { format = "[\${version}\\(\${virtualenv}\\)]($style)"; };