[docs] Remove gitbook directory (#23839)

docs/__capabilities.md

@@ -41,7 +41,7 @@ Unrelated to styling, high-level tech.
 ![QMK Light](./public/badge-community-light.svg)
 ![QMK Dark](./public/badge-community-dark.svg)
 
-<img src="./gitbook/images/color-wheel.svg" alt="HSV Color Wheel" width="250"/>
+<img src="./public/color-wheel.svg" alt="HSV Color Wheel" width="250"/>
 
 ### Lists
 

docs/feature_rgblight.md

@@ -49,7 +49,7 @@ Then you should be able to use the keycodes below to change the RGB lighting to
 
 QMK uses [Hue, Saturation, and Value](https://en.wikipedia.org/wiki/HSL_and_HSV) to select colors rather than RGB. The color wheel below demonstrates how this works.
 
-<img src="./gitbook/images/color-wheel.svg" alt="HSV Color Wheel" width="250"/>
+<img src="./public/color-wheel.svg" alt="HSV Color Wheel" width="250"/>
 
 Changing the **Hue** cycles around the circle.<br>
 Changing the **Saturation** moves between the inner and outer sections of the wheel, affecting the intensity of the color.<br>