Split out plugins and extra config

lua/custom/plugins/init.lua

@@ -2,4 +2,7 @@
 --  I promise not to create any merge conflicts in this directory :)
 --
 -- See the kickstart.nvim README for more information
-return {}
+return {
+	'mg979/vim-visual-multi',
+	'nvim-treesitter/nvim-treesitter-context',
+}