Replace lucia auth with clerk

[wilsonianb]

https://clerk.com/changelog/2024-07-18-clerk-astro

https://dev.to/empe/moving-user-management-from-in-house-to-a-product-why-we-did-it-and-what-we-learned-4o8m

[wilsonianb]

I am planning to deprecate Lucia early next year

https://x.com/pilcrowonpaper/status/1843258855280742481

[wilsonianb]

Lucia auth being deprecated
https://x.com/pilcrowonpaper/status/1843258855280742481

Better Auth is another alternative
https://www.better-auth.com/docs/integrations/astro