Force directory urls on to work around a GitHub change.

Author: SadieCat

mkdocs_dev.yml

@@ -48,3 +48,4 @@ repo_url: https://github.com/inspircd/docs
 site_description: InspIRCd is a modular C++ Internet Relay Chat (IRC) server for UNIX-like and Windows systems.
 site_name: InspIRCd Documentation
 site_url: https://docs.inspircd.org/
+use_directory_urls: true