v3.16.4

Both sites

• Remove deprecated visibleToStudents flag on tests by @jsharkey13 in isaacphysics/isaac-api#678
• Question Finder improvements by @jsharkey13 in isaacphysics/isaac-api#679

Isaac Physics

• Add static page explaining removal of short link by @jsharkey13 in 7cefb3e

Full API Changelog: isaacphysics/isaac-api@v3.18.1...v3.18.2