List only Datum Cloud plugins #237

Summary

Five Milo plugins are listed here as well as in milo-os/cli-plugins, so each has two versions in circulation and two release paths to keep working.

This catalog should end up listing only plugins built in the datum-cloud organization. Until datumctl can tell users where a plugin moved (datum-cloud/datumctl#355), the Milo entries stay here and keep getting updates.

Acceptance criteria

• Each Milo plugin listed here gets the same releases as its entry in milo-os/cli-plugins
• Once datumctl#355 ships, each Milo entry is marked deprecated and points to its entry in milo-os/cli-plugins
• After a deprecation period, this catalog lists only plugins built in the datum-cloud organization