Write an article documenting the Hicolour mode "trick"

[avivace]

Write a guide describing the "Hicolour trick", mentioning how it was used on commercial titles (e.g. Crystalis)

A good starting point: https://romhack.github.io/doc/gbcHiColour/

The guide should fit with the style of the other write-ups on the website: see "Guides" in https://gbdev.io/

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