Deprecate the more unusual colors?

Currently, the defined colors include all primary, secondary, and teriary light and pigment colors. Some of these, though, are unusual color names that students don't know. This has a few consequences:

1. If students want to know all of the available colors, the answer is overwhelming and adds cognitive load.
2. If students want to fine-tune their colors, they start by looking up specific color names to memorize, when we'd prefer that they turn to deeper techniques, such as the `RGB` or `HSL` color spaces, or composition of expressions with functions like `light`, `dark`, `bright`, `dull`, or `mixed`.

Conclusion: perhaps the more unusual color names should be deprecated. This means keeping only the color names that are basic expectations: `red`, `green`, `yellow`, `blue`, `orange`, `pink`, `brown`, `purple`, `white`, `black`, and `gray` (or `grey`). Anything else could be deprecated, and eventually removed.

ファイル、テスト、エントリーポイントのいずれも指定されていません。まず提案されている基本色のリストと示されている学習目標を確認し、次に色の定義を見つけて、非推奨化と最終的な削除が適切かどうかを判断してください。サポート対象のリストと非推奨化／削除の計画について合意できれば完了です。

索引モデルが issue の本文から書いたものです。