Allow multi-line code blocks

[DanielKriz]

When an article contains a code example (it can be easily witnessed in this article: https://muscar.eu/shar-binary-search-meta.html), that spans multiple lines, then shiori shows code just as a single line. I think that it would great if shiori allowed newlines to be preserved in the code block.

[DanielKriz]

Although this article https://til.simonwillison.net/macos/sips has a multi-line code block and everything is displayed correctly.

But on the other hand, there is no syntax highlight. I am not sure how it's handled in shiori (perhaps this is just some bad format in the artictle text?), but it could also be a good addition to the application.