Support code formatting in reader mode

[voydstack]

Supporting code highlighting inside the reader mode (within "pre" and "code" HTML elements for example).

[Jon]

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[pabe]

I'll bump this one. Reader mode could really benefit from improvement, and even though I do know that code highlighting is not necessarily a need for most users, but it would definitely be a neat improvement to the reader.

I tested other browsers and at least Vivaldi and Safari don't handle this either, it could even be a tiny but nice feature and one more reason for software developers to use Firefox.