Point Sim back to Dune

[dericksozo]

Adding an explicit external link back to the dune analytics api docs and removing the comparison page.a

[cursor]

PR Summary

Updates docs navigation to link to Dune’s Analytics API docs externally and streamline the sidebar.

• Adds dune-analytics-api page under Sim APIs with frontmatter linking to https://docs.dune.com/api-reference/overview/introduction
• Removes the separate "Dune Analytics API" group from docs.json and consolidates navigation

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[karimhass]

Maybe just call it Dune Docs?