feat(nix): migrate Neovim to Nix (as a symlink)

nix/home/neovim/nvim/lua/plugins/neogit.lua

@@ -0,0 +1,20 @@
+-- An interactive and powerful Git interface for Neovim
+-- https://github.com/NeogitOrg/neogit
+return {
+  "NeogitOrg/neogit",
+  dependencies = {
+    "nvim-lua/plenary.nvim",
+    "sindrets/diffview.nvim",
+    "nvim-telescope/telescope.nvim",
+  },
+  keys = {
+    {
+      "<leader>gn",
+      function()
+        require("neogit").open()
+      end,
+      desc = "Neogit",
+    },
+  },
+  config = true,
+}