chore(nvim): Some clean up

- Start splitting plugins to their own files
- Config should be loaded first
- Config for plugins should be handled by lazy.nvim

.config/nvim/lua/null/init.lua

@@ -1,6 +1,6 @@
--- vim_plug
-require("null.plug")
 -- vim_uni
 require("null.config")
+-- vim_plug
+require("null.plug")
 -- vim_nix
 require("null.nix")  -- n*x specific stuff