Prepare repo for archival (#131)

It has been unmaintained for over a year. See https://oss-compass.org/analyze/s2cg17ca for data to support this. The last maintainer says it is appropriate to archive: #128 (comment)
bazelbuild · Oct 11, 2023 · d7fcb00 · d7fcb00
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+🚨 rules_appengine is no longer maintained.
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 [![Build status](https://badge.buildkite.com/98ffeea8dc7631a8a7d7af13cbe7570a7209a98ef18fe3cbc5.svg)](https://buildkite.com/bazel/appengine-rules-appengine-postsubmit)