docs: add log collection guide for VM installs

[jlav]

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

Summary of changes

Nothing in the docs tells an operator how to get logs off a VM install. The troubleshooting guide covers one-off diagnostics, so anyone who wants OHE logs flowing continuously into their own observability platform has to work out where the files live on the VM themselves.

This adds a short page under VM Install with the log locations and the steps to point an agent at them.

The page recommends a host-level log agent. It needs no kubernetes access, and a single file glob covers every service on the VM. That glob matches only the active files, so rotated logs don't get re-ingested.

I verified the paths, the permissions, and the tail command in the last step against a running VM install.

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