Don't set background colour for code

[hadley]

Since it looks bad whenever the lines have padding, e.g. https://cli.r-lib.org/reference/cli_code.html#examples

[gaborcsardi]

Yeah, it does not look good there, but it looks good on the screen. I did it to make sure that the colors of the highlighted code look good, regardless of the terminal / console background.

But I agree that it needs improvements. Some ideas:

• we can turn off the syntax highlight for now.
• have a different color scheme for syntax highlighting. In RStudio, we could get the color scheme from the RStudio theme.
• have a different them in pkgdown.

[hadley]

It doesn't look good in RStudio either:

[gaborcsardi]

OK, I'll turn off the bg in RStudio and get the colors from the theme. I'll also get some colors for pkgdown, based on the light bg.

[gaborcsardi]

I can get the RStudio themes from the source: https://github.com/rstudio/rstudio/tree/master/src/cpp/tests/testthat/themes/acecss

[gaborcsardi]

Partially fixed here: r-lib/prettycode@1685923

I'll also remove the background in a sec....