backlight_control: add page (#8041)

* backlight_control: add page

* backlight_control: remove trailing whitespaces

* backlight_control: conjoin first two examples

Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>

* backlight_control: improve syntax

Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>

* backlight_control: improve syntax

Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>

* backlight_control: remove repeated example

Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>
feature/refresh-nano-2
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# backlight_control
> Control a linux machine's backlight using percentage values.
> More information: <https://github.com/Hendrikto/backlight_control>.
- Increase/decrease the backlight by a specific percent count:
`backlight_control {{+|-}}{{5}}`
- Set the backlight strength to a specific percent count:
`backlight_control {{90}}`
- Print the help:
`backlight_control`