Clarify documentiation for what color flags do

[ahgraber]

Problem

I'm trying to build a theme, and it's hard to figure out what some of the css variables do. Example:

  --jp-mirror-editor-variable-color: var(--foreground-light);
  --jp-mirror-editor-variable-2-color: var(--magenta);
  --jp-mirror-editor-variable-3-color: var(--gray);

In this example, --jp-mirror-editor-variable-color appears to change all variables, while variable-2-color and variable-3-color don't do anything.

Proposed Solution

Additional documentation (inline with the template or in the readme / wiki) would be super helpful!

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