This commit: docs(changelog): update whats-new and per-commit entries [skip ci]

Changes – 2025-08-09: Revise Fabric Adoption Framework documentation (7099324)

[Impact: High] Updated the sidebar configuration to collapse the "1 - Define strategy" and "Foundational methodologies" sections by default, improving navigation and reducing visual clutter.
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[Impact: High] Introduced a new document titled "What is the Fabric Adoption Framework?" that provides an overview and structured guidance for organisations adopting Microsoft Fabric, enhancing clarity and support.
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[Impact: Medium] Removed several outdated documentation files related to the Fabric Adoption Framework, which may impact users seeking guidance on adoption strategies.
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[Impact: Medium] Added a new image file to the documentation to enhance visual content and support user understanding of the related topics.
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[Impact: Low] Several .DS_Store files were added and removed in the documentation, which do not impact the content or usability for readers.
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[Impact: Medium] Collapsed sidebar categories for methodologies to streamline user experience and improve content accessibility.
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Why it matters: These changes enhance the organization, clarity, and usability of the documentation, making it easier for users to find relevant information and guidance.