[Docs] RGB Animation documentation on reducing memory footprint (#5813)

[Docs] RGB Animation documentation on reducing memory footprint (#5813)

* Improve Animation docs with example

 - example to reduce flash footprint of animations using RGBLIGHT_EFFECT_ defines

* Re-order the effects list

* Update docs/feature_rgblight.md

Co-Authored-By: yanfali <yanfali@gmail.com>
* Update docs/feature_rgblight.md

Co-Authored-By: yanfali <yanfali@gmail.com>
* Update docs/feature_rgblight.md

Co-Authored-By: yanfali <yanfali@gmail.com>
* Introduce line breaks

* Add title for animation speed section

* Organize Animation Defines Into Groups

* Use the RGB EFFECT recommended by mtei in docs

 - has the most modes, and STATIC_LIGHT can't really be disabled.

* Use more accurate titles for effects and animation

 - accidentally put a toggle in settings