Unicode links

[bergden-resonai]

Related issue: #25098

Description
I started working on Hebrew translation to the docs, and noticed some issues with RTL support and links which use non-[a-zA-Z] characters
It's a pretty big change and there are potentially many follow-up tasks such as:

• Decide if to also allow unicode characters in the href part (need to add % and \p{L} there as well)
• Decide whether to carry this change to other templates (I think that's not relevant, unless the URLs of three.js pages would also be localized, which is not a good idea IMO)
• Find and replace all occurrences where the author localized the link and opted to use inline tags (for example)

The code blocks looks like this currently:

The single line blocks are fine, the multi-line blocks and not-unreadable but are not as nice

This contribution is funded by Resonai