Big re-write :)

I reordered the code in a more clean an organized way. Also this improves a lot
the emacs startup time again, bucause after some updates it becomes a bit slow
with the old configuration, so i did it again in a new way.

configs/lang-go.el

@@ -9,8 +9,7 @@
 
 ;;; Code:
 
-(use-package go-mode
-  :defer t)
+(use-package go-mode)
 
 (provide 'lang-go)
 ;;; lang-go.el ends here