Contribute the MechMerlin QMK Configurator docs (#4986)

Contribute the MechMerlin QMK Configurator docs (#4986)

* first pass at configurator docs

* edit existing docs to make reference to QMK Configurator

* contribute my own newb guide to QMK officially from https://github.com/mechmerlin/qmk_setup/blob/master/qmk_configurator.md

* Update docs/newbs_building_firmware_configurator.md

Co-Authored-By: mechmerlin <30334081+mechmerlin@users.noreply.github.com>
* Update docs/newbs_building_firmware_configurator.md

Big red box!

Co-Authored-By: mechmerlin <30334081+mechmerlin@users.noreply.github.com>
* Update docs/newbs_building_firmware_configurator.md

Big red box

Co-Authored-By: mechmerlin <30334081+mechmerlin@users.noreply.github.com>
* Update docs/newbs_building_firmware_configurator.md

Co-Authored-By: mechmerlin <30334081+mechmerlin@users.noreply.github.com>
* Update docs/newbs_building_firmware_configurator.md

Co-Authored-By: mechmerlin <30334081+mechmerlin@users.noreply.github.com>
* Update docs/newbs_building_firmware_configurator.md

Co-Authored-By: mechmerlin <30334081+mechmerlin@users.noreply.github.com>
* Update docs/newbs_building_firmware_configurator.md

Co-Authored-By: mechmerlin <30334081+mechmerlin@users.noreply.github.com>