ManimColor YELLOW_C is inconsistent with other colors.

[yuan-xy]

Description of bug / unexpected behavior

ManimColor YELLOW_C is inconsistent with other colors.
Maybe we need to change the YELLOW_C to PURE_YELLOW and and a new YELLOW_C like this:

PURE_YELLOW = ManimColor("#FFFF00")
YELLOW_C = ManimColor("#F7D96F")

Then, we get a more consistent color system.

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