Hi KSP community, we just released KSP <2.0.0-1.0....

# ksp

[Jiaxiang]

Hi KSP community, we just released KSP 2.0.0-1.0.21, with this release, we brought more bug fixes into KSP2 and we encourage everyone to try out KSP2 beta. We also prepared documents for migrating to KSP2 beta for a smooth transition.