jekyll-tree.sh: do not generate unneeded tempfile
jekyll-tree.sh: do not generate unneeded tempfile

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Change-Id: I5d420298aa841d04059462c10acb263ecf5cec28
Reviewed-on: https://bazel-review.googlesource.com/#/c/3941
MOS_MIGRATED_REVID=126296592

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