[DOC]Omitting "latest" in a documentation site link results in a 404 error

[kolchfa-aws]

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Before the doc site migration, links like "https://opensearch.org/docs/monitoring-plugins/alerting/monitors/" resolved to "https://opensearch.org/docs/latest/monitoring-plugins/alerting/monitors/". Now, the site is at "https://docs.opensearch.org/" (with redirects from "https://opensearch.org/docs/") but omitting "latest" results in a 404 error. We need to add server-side redirects from "docs.opensearch.org/x" to "docs.opensearch.org/latest/x".

[kolchfa-aws]

@peterzhuamazon Could you take a look when you get a chance please.