UI5 / cli / 23483904914 / 4 – builder

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feat(builder): Add hierarchical subsection support for API reference sections

Implement support for multi-level section structure in API documentation,
allowing sections to contain subsections organized in folder hierarchies.

- Sections can now have subsections (e.g., FAQ.md + FAQ/ folder)
- Main section content displays as "Overview" subsection
- Subsection files automatically loaded from matching directories
- Dropdown navigation shows only subsection names, not parent section
- The new dynamic sections/subsections are bookmark-able the page
  automatically scrolls down to the section

Example structure:
  sections/Component/FAQ.md            "Overview" subsection
  sections/Component/FAQ/Example1.md   "Example1" subsection
  sections/Component/FAQ/Example2.md   "Example2" subsection

JIRA: BGSOFUIPIRIN-6925
Cherry-picked from UI5/openui5@05f6fef35.

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