Move GitHub link right of the search bar.
Move GitHub link right of the search bar.

Similar to the TensorFlow website, having the GitHub link separate at the right
of the search bar makes it more easy to find.

RELNOTES: None

PiperOrigin-RevId: 151810276

davidzchen/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,bazelbuild/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website