[Articles, suggestion] Code block - Add features to allow for minor customization

[liamegan]

Adding line numbers
Changing width

[ciphrd]

None of these can be done with settings. We need to pick an option.
Maybe reducing the width is enough ? I don't quite see the need to some line numbers

[GemN]

We can do the line numbers using fxhash settings instead of markdown (as a comfort setting) I don't personally see the need for an article but if people request it, that's not impossible.