Use modules folder

modules/neovim/default.nix

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+{ pkgs, ... }:
+
+{
+  programs.neovim = { 
+    enable = true;
+    viAlias = true;
+    vimAlias = true;
+    defaultEditor = true;
+    plugins = with pkgs.vimPlugins; [ vim-nix vim-markdown ];
+    extraConfig = builtins.readFile ./vimrc;
+  };
+}

modules/neovim/vimrc

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+" Temporary configuration for editing Nix files
+syntax on set autoindent set expandtab
+set tabstop=2
+set shiftwidth=2
+
+" Shortcutting split navigation
+map <C-h> <C-w>h
+map <C-j> <C-w>j
+map <C-k> <C-w>k
+map <C-l> <C-w>l
+
+" v for vertical, s for side-by-side
+map <C-w>v :split<CR>
+map <C-w>s :vsplit<CR>
+
+" Use system clipboard
+set clipboard+=unnamedplus
+
+" Markdown configuration
+autocmd FileType markdown setlocal spell spelllang+=cjk linebreak expandtab
+let g:vim_markdown_fenced_languages = ['rs=rust', 'RS=rust'] " https://github.com/preservim/vim-markdown/issues/618
+let g:vim_markdown_frontmatter = 1
+
+" Tegaki Tuesday formatting
+autocmd BufRead,BufNewFile */tegakituesday.com/content/** set formatoptions-=r
+" prevent automatically adding new hyphen on enter, though causes some issues
+" https://stackoverflow.com/a/4896097