woot, back up and running, the error was not at al related to nixvim...

modules/desktop/editors/nvim.nix

@@ -12,13 +12,14 @@ in
     programs.nixvim = {
       enable = true;
 
-      options = {
+      opts = {
         number = true;
 
         shiftwidth = 2;
       };
 
-#       colorschemes.gruvbox.enable = true;
+#       colorschemes.base16 = "${pkgs.base16-schemes}/share/themes/everforest.yaml";
+      colorschemes.everforest.enable = true;
 
       plugins = {
         lualine.enable = true;
@@ -29,18 +30,17 @@ in
           servers = {
             tsserver.enable = true;
             lua-ls.enable = true;
-            rust-analyzer.enable = true;
+            rust-analyzer = {
+              enable = true;
+              installRustc = true;
+              installCargo = true;
+            };
           };
         };
 
-        nvim-cmp = {
+        cmp = {
           enable = true;
           autoEnableSources = true;
-          sources = [
-            {name = "nvim_lsp";}
-            {name = "path";}
-            {name = "buffer";}
-          ];
         };
       };
     };

modules/desktop/editors/zed.nix

@@ -0,0 +1,19 @@
+{ config, options, lib, pkgs, ... }:
+let
+  inherit (lib.meta) getExe;
+  inherit (lib.modules) mkIf;
+  inherit (lib.attrsets) attrValues;
+
+  cfg = config.modules.desktop.editors.zed;
+in
+{
+  options.modules.desktop.editors.zed = let
+    inherit (lib.options) mkEnableOption;
+  in { enable = mkEnableOption "zed"; };
+
+  config = mkIf cfg.enable {
+    user.packages = attrValues {
+      inherit (pkgs) zed-editor;
+    };
+  };
+}