Update to nextjs 15

[compojoom]

There is an RC of nextjs 15: https://nextjs.org/blog/next-15-rc

We should update to it as it has some nice features. However in my fast test, after upgrading the packages some of the view were crashing. Also turbo support is now complete: https://areweturboyet.com/ but unfortunately our app doesn't load. We should investigate why and figure out if we can use it or not as it should bring some nice speed improvements to our dev workflows.