Niko/node new template

[nikomancy]

Adding variant of docs for Node.js following the new information architecture and doc structure as the client.js docs.

Most of this content is duplicate boilerplate between client and server js.

Dependencies

These docs are built on top of the Docusaurus 2.x -> 3.x major version update. They shouldn't be merged before that PR is merged.

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[aarsilv]

Thanks for all the improvements--these docs are really shaping up! I have some random comments here and there on the content. Regarding the code examples ,there are a couple of issues I spotted:

1. The Node.js package name is @eppo/node-server-sdk
2. Our init() method type requires an assignmentLogger to be defined--although I think we should adjust our types in the SDK itself.
3. We are inconsistent with our string quoting (we probably want to conform to ")
4. We are inconsistent with our use of TypeScript and Vanilla JS (we probably want to conform to TypeScript)

Also, there are quite a few places we link to the client JavaScript documentation, which could confuse people as they navigate. We'll want to make sure all links, language, and examples are backend-related

[aarsilv]

We need this same change in Quickstart.

Also, unfortunately*, our TypeScript types require assignmentLogger to be defined:

import { init } from "@eppo/js-client-sdk";

// One-time initialization to put in application bootup
await init({
  apiKey: "SDK_KEY",
  assignmentLogger: { logAssignment: (assignmentEvent)=> console.log('Send to warehouse: ', assignmentEvent) },
});

*this is probably something we should consider changing for dev-friendliess

[nikomancy]

My two cents are that changing this in the code depends on whether there are practical situations where you would want to not log assignments. In the meantime, I've updated code samples where init gets invoked to include the placeholder assignmentLogger you put there.