Update dependencies.io handbook page for version 3
Updates some of the information to match the current state of its use. And adds some sections on running the tool locally.
Fixes: gitlab-org/distribution/team-tasks#552 (closed)
Why is this change being made?
The information was outdated, and referenced the previous dependencies.io. version.
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
Edited by DJ Mountney