feat(nvim): add neogen documentation generator

neovim/default.nix

@@ -36,6 +36,7 @@
 
         nvim-treesitter.withAllGrammars
         nvim-treesitter-textobjects
+        nvim-ts-context-commentstring
         markdown-preview-nvim # use({ "iamcco/markdown-preview.nvim", run = ":call mkdp#util#install()" })
         toggleterm-nvim
         nvim-notify
@@ -46,6 +47,7 @@
         plenary-nvim
         vim-illuminate
         vim-surround
+        neogen
 
         # git
         gitsigns-nvim
@@ -166,6 +168,7 @@
             vim.g.gitblame_date_format = "%r"
 
             require("nvim-autopairs").setup({})
+            require("neogen").setup({ snippet_engine = "luasnip" })
         EOF
       '';
     };