WebHost: server render remaining markdown using mistune (#5276)

---------

Co-authored-by: Aaron Wagener <mmmcheese158@gmail.com>
Co-authored-by: qwint <qwint.42@gmail.com>
Co-authored-by: black-sliver <59490463+black-sliver@users.noreply.github.com>

worlds/ahit/__init__.py

@@ -34,7 +34,7 @@ class AWebInTime(WebWorld):
         "Multiworld Setup Guide",
         "A guide for setting up A Hat in Time to be played in Archipelago.",
         "English",
-        "ahit_en.md",
+        "setup_en.md",
         "setup/en",
         ["CookieCat"]
     )]