Reorganize common configuration

hosts/totsugeki/home-manager/development/nixvim/default.nix

@@ -1,49 +0,0 @@
-{ pkgs, ... }: {
-  imports = [
-    ./completion.nix
-    ./lsp.nix
-    ./lualine.nix
-    ./neo-tree.nix
-    ./none-ls.nix
-    ./treesitter.nix
-    ./telescope.nix
-    ./trouble.nix
-  ];
-  programs.nixvim = {
-    enable = true;
-
-    colorschemes.catppuccin = {
-      enable = true;
-      settings = {
-        flavour = "mocha";
-        no_italic = true;
-        transparent_background = true;
-        integrations = {
-          cmp = true;
-          neotree = true;
-        };
-      };
-    };
-
-    globals.mapleader = " ";
-
-    opts = {
-      number = true;
-      cursorline = true;
-      tabstop = 4;
-      shiftwidth = 4;
-      expandtab = true;
-      ttyfast = true;
-      wrap = false;
-      mousemoveevent = true;
-      signcolumn = "yes";
-    };
-
-    plugins = {
-      web-devicons.enable = true;
-      nvim-autopairs.enable = true;
-    };
-
-    extraPlugins = with pkgs.vimPlugins; [ nvim-web-devicons ];
-  };
-}