user-guide: remove EL2GO

[mwasilew]

Foundries Factory is no longer offering EdgeLock2GO integration. Removing from documentation.

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[doanac]

Docs for 300c099 are browsable at: https://ci.foundries.io/projects/fio-docs/builds/2792/docs/artifacts/html/index.html

[kprosise]

LGTM! I grepped and couldn't find any other mentions, so this should do it!