Refactor course id into env var

[ShreyasKallingal]

Extremely significant contribution that allows courses to rebrand the queue. Let me know if you'd like to keep the 61B™️ branding somewhere though :)

Also, explicitly included the minimum node version in package-json.

[vercel]

@ShreyasKallingal is attempting to deploy a commit to the cs61b's Team Team on Vercel.

A member of the Team first needs to authorize it.

[MeshanKhosla]

Lets also add it here to require this at build time https://github.com/Berkeley-CS61B/simple-office-hours-queue/blob/main/src/env/schema.mjs

[ShreyasKallingal]

Fixed!

[MeshanKhosla]

Also clientEnv should be

export const clientEnv = {
  NEXT_PUBLIC_ABLY_CLIENT_API_KEY: process.env.NEXT_PUBLIC_ABLY_CLIENT_API_KEY,
  NEXT_PUBLIC_COURSE_ID: process.env.NEXT_PUBLIC_COURSE_ID,
};

and then we can change cosntants.ts to be

import { clientEnv } from "../env/schema.mjs";

export const COURSE_ID = clientEnv.NEXT_PUBLIC_COURSE_ID!;

just to stay consistent

[ShreyasKallingal]

Ah got it, fixed.