docs: Cookbook page

[abernier]

Add a docs/cookbook.mdx page with different recipes:

How to convert a fiber Vector3 into a THREE.Vector3

Fiber has a Vector3 type which can be:

• new THREE.Vector3(2,2,2) -- a THREE.Vector3
• [2,2,2] -- a 3-tuple
• 2 -- a number

function toThreeVec3(v: Vector3) {
  return v instanceof THREE.Vector3 ? v : new THREE.Vector3(...(typeof v === 'number' ? [v, v, v] : v))
}

Using <Suspense> with suspend-react

TODO: but can get inspired from https://discord.com/channels/740090768164651008/740094974187798609/1306911036716355594

[krispya]

It's an interesting idea. I also noticed it isn't so obvious right now how to do things like extend R3F for custom classes with types. It makes me think we need to organize the docs better in general.