Refactor home manager, and add desktop node on sparky.

home/profiles/server.nix

@@ -0,0 +1,27 @@
+{ pkgs }:
+let
+  corePkgs = with pkgs; [
+    direnv
+    fzf
+    git
+    mosh
+    ripgrep
+    tmux
+    zsh
+  ];
+
+  pythonEnv = pkgs.unstable.python3.withPackages (ps: [
+    ps.google-generativeai
+    ps.ipython
+  ]);
+
+  fishPkgs = with pkgs.fishPlugins; [
+    pure
+    # don't add failed commands to history
+    sponge
+    transient-fish
+  ];
+in
+{
+  packages = corePkgs ++ [ pythonEnv ] ++ fishPkgs;
+}