"Uncaught ReferenceError: $ is not defined" when visiting page

[Former user]

1. Go to https://wikishootme.toolforge.org/original.html
2. See:

Uncaught ReferenceError: $ is not defined <anonymous> https://wikishootme.toolforge.org/wsm.js:5

3. Click "Go!" button
4. See:

Uncaught ReferenceError: $ is not defined run https://wikishootme.toolforge.org/wsm.js:49 onclick https://wikishootme.toolforge.org/original.html:1