feat: Minimal Next.js Example with Web Push Button

[niyabits]

Updates the repository with a minimal Web Push Example.

[moxley01]

Tested it and it does seem to work! It's much simpler than the code it intends to replace, which is a good thing.

I'm concerned about completely overwriting the existing repo given how its relatively popular. It's removing a few things:

• the hacker news subscription, which judging by the logs, a few people seem to be making use of
• the new readme has removed the focus on ios (and the specific installation steps for ios), which i think is important given the repo name
• there were some quite detailed error states which detected relevant things about the user's device (e.g. visit https://webpushtest.com in an incognito browser) which are no longer present

@unamashana had the idea of a monorepo to contain lots of "quick setup" things like this. So I wonder if its best to add it there once it's created?

[niyabits]

@moxley01

the new readme has removed the focus on ios

We could change the name of the repo or I could add the instructions for iOS.
I have tested the repo on iOS and it's working perfectly.

there were some quite detailed error states which detected relevant things about the user's device

I left out most of the things deliberately to make sure the code is simple and understandable.

[unamashana]

@niyabits @moxley01 I think the best path forward is to move with with an example app (starting with this button) in the https://github.com/magicbell/magicbell-js/tree/main/example repo.

[niyabits]

Thanks for the suggestions! :)
I will make a PR in the magicbell-js with the example.