Add Nord theme (and lazy load vsc theme extensions)

Thanks @iljo-dp for finding the themes!

themes/neovim/nord.lua

@@ -0,0 +1,9 @@
+return {
+	{ "shaunsingh/nord.nvim" },
+	{
+		"LazyVim/LazyVim",
+		opts = {
+			colorscheme = "nord",
+		},
+	},
+}