refactor: move modules to their own dir

modules/nixvim/options.nix

@@ -0,0 +1,37 @@
+{ lib, ... }:
+let
+  inherit (lib) mkEnableOption mkOption types;
+  mkDisableOption =
+    desc:
+    mkEnableOption desc
+    // {
+      default = true;
+      example = false;
+    };
+in
+{
+  options.jhome.nvim = {
+    enable = mkDisableOption "jalil's Neovim configuration";
+    reduceSize = mkEnableOption "reduce size by disabling big modules";
+    dev = mkOption {
+      type = types.submodule {
+        options = {
+          enable = mkDisableOption "development configuration";
+          bundleLSPs = mkDisableOption "bundling LSPs with Neovim (decreases size when disabled)";
+          bundleGrammars = mkDisableOption "bundling treesitter grammars with Neovim (barely decreases size when disabled)";
+        };
+      };
+      default = { };
+      example = {
+        enable = false;
+      };
+      description = ''
+        Development options
+
+        Disabling this is advised for headless setups (e.g. servers), where you
+        won't be doing software development and would prefer to instead have a
+        smaller package.
+      '';
+    };
+  };
+}