Update known-plugins.asciidoc (#75388)

Remove Conveyor as the Project has been archived by the owner

(cherry picked from commit 8171283f3a2b836b535e1c681087370b9c8a9351)

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

docs/plugins/known-plugins.asciidoc

@@ -14,7 +14,6 @@ This list of plugins is not guaranteed to work on your version of Kibana. Instea
 * https://github.com/sivasamyk/logtrail[LogTrail] - View, analyze, search and tail log events in realtime with a developer/sysadmin friendly interface
 * https://github.com/wtakase/kibana-own-home[Own Home] (wtakase) - enables multi-tenancy
 * https://github.com/asileon/kibana_shard_allocation[Shard Allocation] (asileon) - visualize elasticsearch shard allocation
-* https://github.com/samtecspg/conveyor[Conveyor] - Simple (GUI) interface for importing data into Elasticsearch.
 * https://github.com/wazuh/wazuh-kibana-app[Wazuh] - Wazuh provides host-based security visibility using lightweight multi-platform agents.
 * https://github.com/TrumanDu/indices_view[Indices View] - View indices related information.
 * https://github.com/johtani/analyze-api-ui-plugin[Analyze UI] (johtani) - UI for elasticsearch _analyze API