[Docs] Update hand wire guide (#7044)

[Docs] Update hand wire guide (#7044)

* Reorganised Hand Wire Guide

Added some images and put the "Matrix" section in a hidden <details> section

* Actually adding images this time

removed .jpg from .gitignore

* Hand wire guide updated

Incomplete, but started making the guide more general.  Will continue to add images (in imgur as requested)

* Removed some more images from gitignore

* testing image changes (temporary)

* Update hand_wire.md

* added techniques table

* Tweaking the table

* Finished soldering guide

* Fixed some links, change image scaling

* More of the same

* resizing images

* updated images

* Update hand_wire.md

* Resizing images

* Update hand_wire.md

* Update hand_wire.md

* Create ribbon_cable.jpg

* Minor updates to links

* Updated firmware and flashing guidelines

* Updated images to imgur links and re-added images to gitignore

* Implemented requested changes.  Improved wording

* Added handwire helpers info and split KB info

* Update hand_wire.md

* Removed "the" from "the QMK toolbox"

* Fixed handwire helper table and image size

* Fixed a heading