Use ANSI colors for the default theme. #621
Merged
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For many users, code that was printed red was difficult to read, depending on the background color.
The reason is that our themes, which are coming from Pygments all use RGB colors instead of ANSI colors, and we render using 256 colors by default.
This patch adopts the default Pygments theme, but using the closest ANSI color as the default theme, so that we take the ANSI colors that are configured in the terminal, which should normally provide sufficient contrast with the background.