refactor: move yazi/helix into server related apps

home/base/server/helix/README.md

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+# Helix Editor
+
+Neovim is really powerful, and have a very active community. I use it as my main editor, and I'm very happy with it. I use it for everything, from writing code to writing this document.
+
+But its configuration is a bit complex, and finding the right plugins, writing configurations, and keeping everything up to date is not easy.
+
+That's why I'm interested in Helix, Helix is similar to Neovim, but it's more opinionated, and it's batteries included.
+Whether I'll switch my main editor to Helix or not, it gives me a lot of ideas on how to improve my Neovim workflow.
+
+## Differences between Neovim and Helixer
+
+1. Neovim have a very activate plugin ecosystem, and it's easy to find plugins for almost everything.
+    1. Helix is still new, and it even do have a stable plugin system yet. A PR to add a plugin system is still envolving: <https://github.com/helix-editor/helix/pull/8675>
+2. Neovim has intergrated terminal, and it's very powerful. It's quite similar to VSCode's intergrated terminal. I use it a lot.
+    1. Helix doesn't have a intergrated terminal yet, as it's complicated to implement. Users are recommended to use tmux/zellij or Wezterm/Kitty to implement this feature instead.
+    1. <https://github.com/helix-editor/helix/issues/1976#issuecomment-1091074719>
+    1. <https://github.com/helix-editor/helix/pull/4649>
+    1. **My Neovim often gets stuck when I switch to [toggleterm.nvim](https://github.com/akinsho/toggleterm.nvim), this Helix issue made me consider to switch from this neovim plugin to zellij**.
+

home/base/server/helix/default.nix

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+{
+  pkgs,
+  nur-ryan4yin,
+  ...
+}: {
+  # https://github.com/catppuccin/helix
+  xdg.configFile."helix/themes".source = "${nur-ryan4yin.packages.${pkgs.system}.catppuccin-helix}/themes/default";
+
+  programs.helix = {
+    enable = true;
+    package = pkgs.helix;
+    settings = {
+      theme = "catppuccin_mocha";
+      editor = {
+        line-number = "relative";
+        cursorline = true;
+        color-modes = true;
+        lsp.display-messages = true;
+        cursor-shape = {
+          insert = "bar";
+          normal = "block";
+          select = "underline";
+        };
+        indent-guides.render = true;
+      };
+      keys.normal = {
+        space = {
+          space = "file_picker";
+          w = ":w";
+          q = ":q";
+        };
+        esc = ["collapse_selection" "keep_primary_selection"];
+      };
+    };
+  };
+}

home/base/server/yazi.nix

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+{pkgs-unstable, ...}: {
+  # terminal file manager
+  programs.yazi = {
+    enable = true;
+    package = pkgs-unstable.yazi;
+    enableBashIntegration = true;
+    # TODO: nushellIntegration is broken on release-23.11, wait for master's fix to be released
+    enableNushellIntegration = false;
+  };
+}