refactor: simplify Nix configuration and update dependencies

Replaced custom Nerd Fonts overrides with predefined ones. Removed unused Neovim settings and plugins, and disabled Neovim for a specific user. Updated various flake dependencies to their latest versions.

modules/home/tools/jetbrains/default.nix

@@ -1,9 +1,8 @@
-{
-  options,
-  config,
-  lib,
-  pkgs,
-  ...
+{ options
+, config
+, lib
+, pkgs
+, ...
 }:
 
 with lib;
@@ -20,13 +19,9 @@ in
     home.sessionPath = [ "$HOME/.local/share/JetBrains/Toolbox/scripts" ];
     home.packages = with pkgs; [
       jetbrains-toolbox
-      (pkgs.nerdfonts.override {
-        fonts = [
-          "FiraCode"
-          "DroidSansMono"
-          "JetBrainsMono"
-        ];
-      })
+      nerd-fonts.fira-code
+      nerd-fonts.droid-sans-mono
+      nerd-fonts.jetbrains-mono
     ];
   };
 }