docs: restructure and refresh the documentation guides#704

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Commits on May 19, 2026

squash: docs/working-with-solvers (#685)
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squash: refactor/oetc-as-solver (#697)
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docs: restructure toctree into 5 sections; new quick-start + dispatch notebooks

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docs: move coming-from-other-tools to Getting Started

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docs(notebooks): reframe creating-variables; tighten quick-start and first-real-model intros

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docs: reframe creating-expressions; show H3 in right-sidebar TOC

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Commits on May 20, 2026