Bazel DevSite: Add link to 5.3 docs
Also drop 5.1 to save some space.
toc:
+- label: "5.3"
+ path: https://docs.bazel.build/versions/5.3.0/bazel-overview.html
- label: "5.2"
path: https://docs.bazel.build/versions/5.2.0/bazel-overview.html
- label: "5.1.1"
path: https://docs.bazel.build/versions/5.1.1/bazel-overview.html
-- label: "5.1"
- path: https://docs.bazel.build/versions/5.1.0/bazel-overview.html
- label: "5.0"
path: https://docs.bazel.build/versions/5.0.0/bazel-overview.html
- label: "4.2.2"
