Automatically add soft-hyphens in inline <code> elements

[capnfabs]

Right now, inline code elements wrap like this:

This isn't as nice as it could be. Instead, we could do something like:

• Look for ( and . characters
• Insert a soft hyphen (https://unicode.org/reports/tr14/#SoftHyphen) there.

This should only be done for inline code, and it's not perfect -- newlines actually mean something in some languages -- but I think it's probably pretty safe for inline code?

Creating an issue so I can mull on this for a while before actually building it.