✨ [shared] Replace Neovim with Helix

Moved Helix editor to shared.
Removed Nixvim flake and it's config

hosts/pi4/home-manager/default.nix

@@ -10,13 +10,13 @@
   imports = [
     inputs.catppuccin.homeModules.catppuccin
     (lib.custom.relativeToRoot "shared/home-manager/development/git.nix")
+    (lib.custom.relativeToRoot "shared/home-manager/development/helix.nix")
     (lib.custom.relativeToRoot "shared/home-manager/shell/btop.nix")
     (lib.custom.relativeToRoot "shared/home-manager/shell/eza.nix")
     (lib.custom.relativeToRoot "shared/home-manager/shell/fastfetch.nix")
     (lib.custom.relativeToRoot "shared/home-manager/shell/fish.nix")
     (lib.custom.relativeToRoot "shared/home-manager/shell/zoxide.nix")
     (lib.custom.relativeToRoot "shared/home-manager/gpg.nix")
-    ./helix.nix
   ];
 
   home.stateVersion = systemConfig.version;

hosts/pi4/home-manager/helix.nix

@@ -1,30 +0,0 @@
-{ pkgs, theme, ... }:
-
-{
-  catppuccin.helix = {
-    enable = true;
-    flavor = theme.flavor;
-  };
-
-  programs.helix = {
-    enable = true;
-    defaultEditor = true;
-    settings = {
-      editor = {
-        cursor-shape = {
-          normal = "block";
-          insert = "bar";
-          select = "underline";
-        };
-        lsp.display-messages = true;
-      };
-    };
-    languages.language = [
-      {
-        name = "nix";
-        auto-format = true;
-        formatter.command = "${pkgs.nixfmt-rfc-style}/bin/nixfmt";
-      }
-    ];
-  };
-}