Most appropriate sections of the p5.js website?

Reference

What is your operating system?

None

Web browser and version

No response

Actual Behavior

Empty examples are shown on several reference pages.
e.g. https://p5js.org/reference/p5/background/

Expected Behavior

Empty examples are not displayed.

Steps to reproduce

1. Open https://p5js.org/reference/p5/background/
2. Scroll to the end of the example.

Would you like to work on the issue?

I will create PR