Add a warning on Math.random()

[maxwofford]

Fixes #161

// when you run the following...
console.log(Math.random())
console.log(Math.random())
console.log(Math.random())
console.log(Math.random())

WARN> Math.random() called! This could cause issues if done unintentionally. https://github.com/hackclub/blot/issues/161
> 0.6913689623313306
> 0.8114130283005876
> 0.2853826537241573
> 0.217250787267246

[vercel]

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Name	Status	Preview	Updated (UTC)
blot	❌ Failed (Inspect)		Dec 19, 2023 5:15am
blot-3dgallery	✅ Ready (Inspect)	Visit Preview	Dec 19, 2023 5:15am

[maxwofford]

This build will fail while #210 is unmerged