feat: new auth & payment system

[nperez0111]

For the auth system I chose to go with better-auth and for the payment system, I chose to go with polar.sh.

There is an already existing integration between the two, maintained by the polar team, as a better-auth plugin.
It's documented on both sides polar's docs and better-auth's docs.

Why Better-auth?

• Framework agnostic
• We control our users (can adapt to pretty much any DB)
• Simple integration & flexible management

Why Polar?

• MoR simplifies the accounting side
• 20% less than other MoRs
• EU-based (Sweden)
• Open Source (Apache-2.0)

This PR implements an integration for our Next.js application, it uses the better-auth Next.js integration, and then uses the polar better-auth integration on top of that.

Things to sort out

• What signin methods do we want to support? better-auth supports a number of them (see sidebar)
• We will need to build a couple of pages
• After payment page
• Subscription status link (/api/auth/portal/)
• Use the subscription status to decide when to show the code examples or not for pro stuff
• Where to host the DB (I'm biased to self-host as this will be VERY low-traffic)

Demo

Screen.Recording.2025-04-18.at.17.55.34.mp4

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commit: 06e8a4d

[YousefED]

What signin methods do we want to support?

imo

• github
• email + magic link
• email + password (optional)

wdyt?

We also need to think about what to do with current sponsors. If we can easily detect sponsors when people sign in with github, that would be great. However, I wouldn't spend more than 2-3 hours on this. If we can't make it work we can hardcode a list of sponsors or sth