Fix internal links with question marks

[h-m-f-t]

This change makes links work again!

When the site shifted to its new template, it likely deployed with a newer version of Jekyll than before (...or something) that in the creation of HTML omits question marks (and other non-alphanumerics) in the creation of header IDs. It previously used the percent-encoding %3f for question marks.

There may be other things that the shift shifted, but I think I've removed all the %3fs in the repo.

[konklone]

Thank you! I didn't notice this at all, though I bet it's an artifact of me updating dependencies in #241. This included an update to redcarpet, which is responsible for generating the anchor slugs from header names. There are a number of entries in the changelog related to anchor generation between 3.1.2 and 3.4.0 that could explain the change.

Ideally, we'd restore the old behavior, so as not to break past links. But the changes in redcarpet look to be positive changes to fix bugs and handle non-ASCII characters better, and there's no obvious option to opt in to the old behavior.

So I guess we'll just deal with anchor breakage. This isn't nearly as bad as URL breakage, since it degrades to loading the intended page anyway.

I really appreciate you fixing this!