Document file locations for agent installations

[dedemorton]

Documents where to find log files and other files installed or created by Elastic Agent.

TODO:
[ ] - After this is merged, update the troubleshooting docs to point to this topic.

[elasticmachine]

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• Build Cause: [Pull request #21277 updated]

• Start Time: 2020-10-01T02:28:28.321+0000

• Duration: 26 min 30 sec

[elasticmachine]

Pinging @elastic/obs-docs (Team:Docs)

[EricDavisX]

the path for Endpoint is not related to extracted path, since Agent controls and downloads it, it always puts it to the same location (different on different systems)

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[ph]

There missing information concerning the paths, with the addition of the install subcommand the path changed slighted and closer to endpoint. See #21019

[dedemorton]

@ph Right. I wanted to get this into 7.9 first before changing the paths (forgot to add the label). I like Blake's simpler list format though, so I'll push another commit. I'll also move the content to the same page as the installation instructions. I'm waffling a bit on the best way to structure content right now because I'm trying to create something that will work in our old system (non-sticky nav) and our new system (awesome sticky nav with dynamic mini TOC). But I think it's weird to have this as a standalone topic.

[dedemorton]

Actually I will just close this PR and open one against 7.9 instead. I'll create a separate PR for 7.10 because I'll need to update other installation-related docs.