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

nix/home/neovim/nvim/lua/plugins/lsp-progress.lua

@@ -0,0 +1,7 @@
+return {
+  "linrongbin16/lsp-progress.nvim",
+  dependencies = { "nvim-tree/nvim-web-devicons" },
+  config = function()
+    require("lsp-progress").setup()
+  end,
+}