Add support for next15 - next-contentlayer2

[alexandprivate]

With the recent release of next15 stable version, a lot of project will migrate to it, currently the peer deps in next-contentlater2 are for:
"next": "^12 || ^13 || ^14",

[k-ardliyan]

Hi @timlrx,

I fully support this! With the stable release of Next.js 15, having next-contentlayer2 support it would be a huge help. Many projects, including ours, are migrating to Next.js 15, so getting this update soon would be really appreciated.

Hope to see it happen soon! ✨

[timlrx]

Yes, most certainly. Let me give it a try tomorrow just to make sure that there are no unforeseen issues and I will bump up the dependencies and publish a new build.

[alexandprivate]

Thank you so much @timlrx !

[timlrx]

Released as contentlayer and next-contentlayer 0.5.3. You would probably still have to ignore peer-dependencies as many other packages are still not updated but at least contentlayer should not be the issue.