[Keymap] Add a tweaked Redox keymap (#5422)

[Keymap] Add a tweaked Redox keymap (#5422)

* Add nrichers keymap

* Additional keymap tweaks, add readme info

* Improve descriptions for changes from default keymap

* Add image of keymap, update .gitignore to

* Add image link

Adds an image of the modified keymap.

* Improve legibility of keymap changes with colour coding

* Tinker with color codes in Markdown

* Experiment with colour codes

* Tinker more with colour codes

* Figured out the easiest way to include colour coding

* Undo earlier .gitignore change