Support interactive code examples

[huyenltnguyen]

Description

Refer to freeCodeCamp/freeCodeCamp#61805.

[Sembauke]

We probably need to use phoneIDE for this.

[Nirajn2311]

How big of a change/impact will depend on how much we want to use codesandbox. Because if we completely replace the editor in the website with codesandbox then it'll be a huge change that'll require some research on implementing it here. But if it stays just as a small interactive codepen-like embed then yea there's not much to discuss then.