handwired/reddot refactor, Configurator support and readme update (#4886)

handwired/reddot refactor, Configurator support and readme update (#4886)

* handwired/reddot: refactor

- reddot.h
  - updated to use #pragma once include guard
  - renamed layout macro KEYMAP to LAYOUT
  - refactored arguments to more closely resemble physical layout
  - aligned for readability
- keymaps/default/keymap.c
  - now uses #include QMK_KEYBOARD_H
  - updated include path for keymap_french.h
  - refactored to use short keycodes
  - aligned for readability

* handwired/reddot: Configurator support

* handwired/reddot: readme update

- update readme to current QMK template
- add KLE permalink to my best guess at the layout