modules: start breaking down core modules; simplify tree structure

modules/plugins/utility/diffview/config.nix

@@ -0,0 +1,20 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib) mkIf nvim;
+
+  cfg = config.vim.utility.diffview-nvim;
+in {
+  config = mkIf (cfg.enable) {
+    vim.startPlugins = [
+      "diffview-nvim"
+      "plenary-nvim"
+    ];
+
+    vim.luaConfigRC.diffview-nvim =
+      nvim.dag.entryAnywhere ''
+      '';
+  };
+}

modules/plugins/utility/diffview/default.nix

@@ -0,0 +1,6 @@
+_: {
+  imports = [
+    ./config.nix
+    ./diffview.nix
+  ];
+}

modules/plugins/utility/diffview/diffview.nix

@@ -0,0 +1,7 @@
+{lib, ...}: let
+  inherit (lib) mkEnableOption;
+in {
+  options.vim.utility.diffview-nvim = {
+    enable = mkEnableOption "diffview-nvim: cycle through diffs for all modified files for any git rev";
+  };
+}