I noticed someone using `<pre>` for styling, and thought, sure why not!
I haven't added support for the code block indent thing, and I think that's probably fine?
A lot of DTI lists use old URLs to anchor-link between lists! Here, we rewrite those URLs to match what DTI 2020 expects, so that they actually correctly jump you across the page and aren't filtered out!
Pulled MarkdownAndSafeHTML into a shared component, and use it on the single list page now too!
I also simplified some of the logic for the item list, because I figure we'll have to give the trade matching stuff its own pass, y'know?
