Fix links for k/design-proposals-archive

The contributors/design-proposals in k/community was removed. It's only
available in k/design-proposals-archive repo now.

This commit also changes https://github.com/kubernetes/repo/blob/master/file.md
to https://git.k8s.io/repo/file.md for better consistency.

content/en/releases/release.md

@@ -124,7 +124,7 @@ The general labeling process should be consistent across artifact types.
   referring to a release MAJOR.MINOR `vX.Y` version.
 
   See also
-  [release versioning](/contributors/design-proposals/release/versioning.md).
+  [release versioning](https://git.k8s.io/design-proposals-archive/release/versioning.md).
 
 - _release branch_: Git branch `release-X.Y` created for the `vX.Y` milestone.
 

content/en/releases/version-skew-policy.md

@@ -21,7 +21,7 @@ Specific cluster deployment tools may place additional restrictions on version s
 ## Supported versions
 
 Kubernetes versions are expressed as **x.y.z**, where **x** is the major version, **y** is the minor version, and **z** is the patch version, following [Semantic Versioning](https://semver.org/) terminology.
-For more information, see [Kubernetes Release Versioning](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/release/versioning.md#kubernetes-release-versioning).
+For more information, see [Kubernetes Release Versioning](https://git.k8s.io/design-proposals-archive/release/versioning.md#kubernetes-release-versioning).
 
 The Kubernetes project maintains release branches for the most recent three minor releases ({{< skew latestVersion >}}, {{< skew prevMinorVersion >}}, {{< skew oldestMinorVersion >}}).  Kubernetes 1.19 and newer receive approximately 1 year of patch support. Kubernetes 1.18 and older received approximately 9 months of patch support.