Fix text direction for commands in RTL pages

When we add latin characters for commands in RTL pages, they are identified as being LTR and displayed almost correctly.

Almost, because when they have neutral-direction characters, those are still layered as RTL, and so, many commands are broken and will not work if copied by the users:

If we insert UTF-8 embedded direction characters, many times they are removed because they are fishy (for example, they will be removed from the page if you edit it in the gitlab editor).

So I think we can try to solve this by giving the <code> style a forced LTR direction. This will probably make sense to do in lego, but I will try on one lektor before to see if it works.