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/cli-apps/starship/default.nix

@@ -1,8 +1,7 @@
-{
-  lib,
-  config,
-  pkgs,
-  ...
+{ lib
+, config
+, pkgs
+, ...
 }:
 let
   inherit (lib) mkEnableOption mkIf;
@@ -16,13 +15,9 @@ in
 
   config = mkIf cfg.enable {
     home.packages = with pkgs; [
-      (pkgs.nerdfonts.override {
-        fonts = [
-          "FiraCode"
-          "DroidSansMono"
-          "JetBrainsMono"
-        ];
-      })
+      pkgs.nerd-fonts.fira-code
+      pkgs.nerd-fonts.droid-sans-mono
+      pkgs.nerd-fonts.jetbrains-mono
     ];
     programs.starship = {
       enable = true;