Simple emacs configuration with many improvements without any external package.
The idea is to have an emacs config that loads as efficiently as possible and could be ported in machines without network connection or access to elpa or melpa.
This config requires emacs 27 because many of the functionalities enabled are only available in emacs 27 (or higher).
If you are reading this part probably you don't have any previous emacs configuration. So maybe you only need:
cd ~
git clone this_repo_url .emacs.d