refactor: move mdx.nvim and neodim plugins to correct files for better organization

lua/plugins/utility.lua

@@ -272,4 +272,29 @@ return {
             { 'fL', 'zL', desc = 'Half screen to the right' },
         },
     },
+
+    -- Dimming the highlights of unused functions, variables, parameters, and more.
+    {
+        'zbirenbaum/neodim',
+        enabled = false,
+        event = 'LspAttach',
+        config = function()
+            require('neodim').setup({
+                alpha = 0.5,
+                blend_color = nil,
+                hide = {
+                    underline = true,
+                    virtual_text = true,
+                    signs = true,
+                },
+                regex = {
+                    '[uU]nused',
+                    '[nN]ever [rR]ead',
+                    '[nN]ot [rR]ead',
+                },
+                priority = 128,
+                disable = {},
+            })
+        end,
+    },
 }