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This builds on top of #2; only the last 1 commit is new.
This removes the grey (if a syntax highlighting language is set) or mostly empty (if not) bar on top of a code block; the highlighting language name is removed with it. (This name was made visible in #2 by fixing the code block theme.)
However, the copy button is still there: it's still in the right-top corner of the code block, and thus overlaps a small part of the first line of a code block. This is typically not really a problem, but any suggestions for how to improve that are welcome.