Update README.md

Archiving workshop
2020-12-01 10:59:29 -08:00 · 2020-12-01 10:59:29 -08:00 · 59811e2342
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-## Effective December 1, 2020 this workshop will be archived.  Materials remain available through November but are no longer being maintained.
+## This workshop is archived and is no longer being maintained. Content is read-only.

 # OSS PaaS and DevOps