[Frontend] Change syntax highlighter for Python

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@bluenex if you have some time, can we change the syntax highlighter for Python which looks like the current format:

To something easier to read e.g. on https://www.programiz.com/python-programming/assert-statement. I think having an inline code block with just one plain code block would be easier to read.

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It's probably here or here that we have to edit.

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Close via #30