Expand Quickstart explanation re. access keys & integrations

[rmoff]

Nice suggestion from @arielshaqed :

Is there any way to keep an explanation of access keys around? Probably towards the end of the quickstart -- so readers will be able to get started with their own tools.
In general I think we might make it clear that DuckDB is only one tool that works with lakeFS. I really like lakeFS for being a tool rather than a framework, and prefer that our messaging (also) explain that. I realize that this is a lot to ask, especially of a quickstart.

Originally posted by @arielshaqed in #6092 (review)

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