Rework info.json reference (qmk#21324)

* Rework info.json reference

* Apply suggestions from code review

Co-authored-by: Sergey Vlasov <sigprof@gmail.com>

* Update backlight.pins description

* Add rgblight.driver and lowercase other driver names

* Remove `split.main` and `split.matrix_grid` for now as they are not working yet

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Co-authored-by: Sergey Vlasov <sigprof@gmail.com>