[docs] Add prepend option on emotion caches to allow JSS style overrides #23892
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This PR adds the
prepend
option to the emotion caches that we use in the docs, to allow emotion's styles to be injected first, which will allow JSS overrides. The need of this has been discovered, by the argos differences in #23841 - once we converted theTypography
component, which is widely used, we need to allow JSS (makeStyles
) to override the styles for it.