Improve documentation site layout#1578

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timsaucer wants to merge 11 commits into

apache:mainfrom

timsaucer:doc/phase1-theme-refresh

Commits on Jun 5, 2026

docs: refresh theme — pydata-sphinx-theme 0.16, top navbar, dark mode

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docs: collapse navbar to section landing pages

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docs: restore external links lost in navbar restructure

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docs: render Rust API link as docs.rs icon next to GitHub

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docs: render sidebar nav on landing page

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docs: render expandable chevrons in sidebar nav

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docs: expand sidebar to show level 2 entries by default

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docs: add Links sidebar section for external references

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docs: consolidate external URLs into a single Links nav item

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docs: add favicon matching the main datafusion site

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docs: address Copilot review feedback on sidebar config

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