archiving outdated tutorial (#1565)

Current information about moving traffic to a different version is here: https://cloud.google.com/appengine/docs/flexible/nodejs/migrating-traffic#migrating_traffic_to_a_new_version
GoogleCloudPlatform · Dec 31, 2020 · b5da5f0 · b5da5f0
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diff --git a/...-app-back-to-a-previous-version-part-1.md → ...-app-back-to-a-previous-version-part-1.md b/...-app-back-to-a-previous-version-part-1.md → ...-app-back-to-a-previous-version-part-1.md