Add Walkthrough to Help

[digitalfrost]

Nature of issue?

• Found a bug
• Existing feature enhancement
• New feature request

Feature enhancement details:

In the Help & Feedback drop-down an FAQ link should be added.

This should link to a documentation page describing common gotchas. For example, how to use external resources.

Such a link will be better for users and will also avoid "polluting" the p5.js documentation with problems such as processing/p5.js#3283

[digitalfrost]

This page of the CodePen documentation could be a helpful source of inspiration for the FAQ page.

[catarak]

I like this idea! I made a video that goes through how to do stuff like this in the web editor, and Dan Shiffman made some too, so at the very least we could link to those.

[siddhant1]

@CatArk should I add them in the FAQ section?
Any particular styling you want?

[catarak]

before thinking about styling, i think it makes sense to actually write out the content we want in the FAQ.