Update documentation to 2.1.0

Closes #10728.

PiperOrigin-RevId: 293830996
diff --git a/site/_config.yml b/site/_config.yml
index d50b53f..f542f33 100644
--- a/site/_config.yml
+++ b/site/_config.yml
@@ -11,11 +11,12 @@
 gems: [jekyll-paginate]
 
 # Update this to the newest release for the default docs.bazel.build version.
-version: "2.0.0"
+version: "2.1.0"
 
 # This must be kept in sync with //scripts/docs:doc_versions.bzl
 doc_versions:
   - master
+  - 2.1.0
   - 2.0.0
   - 1.2.0
   - 1.1.0