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

Changes – 2025-08-10: Revise "What's New" Documentation Section (9efd2d5)

[Impact: High] The "What's New" documentation section has been entirely removed, streamlining the user experience by eliminating redundancy and focusing on more relevant content.
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[Impact: High] A new page titled "What is the Fabric Adoption Framework?" has been created, providing a comprehensive introduction and best practices for adopting Microsoft Fabric.
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[Impact: Medium] The sidebar for the "1 - Define strategy" category has been updated to be collapsed by default, improving the initial navigation experience for users.
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[Impact: Medium] The document now includes a detailed "Table of Contents" section, allowing users to quickly navigate to specific topics within the new page.
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[Impact: Medium] The "Foundational methodologies" section is now expanded in the navigation structure, making it more accessible for users to locate relevant content.
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[Impact: High] New articles have been added that provide essential guidance on defining missions, objectives, and strategies for Microsoft Fabric adoption, significantly enhancing the documentation's value.
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[Impact: Medium] The introduction of visual elements, including diagrams and tables, enhances the understanding of complex concepts related to Fabric adoption strategies, improving user experience.
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[Impact: Low] Minor updates to existing content for clarity and conciseness, improving overall documentation quality without altering the main structure.
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Why it matters: These changes enhance the clarity, structure, and usability of the documentation, making it easier for readers to navigate and apply the information effectively.