In the middle of this post:
Unity whats next for us for scriptable render pipelines
Our goal is to ship verified graphics packages as part of core Unity. There will no longer be versions distributed via package manager. This means that each shipped version of Unity will have Universal Render Pipeline (URP), High Definition Render Pipeline (HDRP), Shader Graph, and VFX Graph that have been validated to work well with that release. This removes the headache of figuring out the matching versions - it will just work out of the box.
There is another post about changing the numbering scheme (Example: URP 11.0 will become URP 2021.1 etc to match the unity version), I could not find the post though
My guess is the github being archive is the start of moving SRPs back into core unity.
But like others have said we will need to wait for the official blog post.