Refactor documentation structure and address review feedback#18

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Copilot wants to merge 3 commits intofeat/redpanda/v1-rcfrom

copilot/sub-pr-16

Commits on Jan 7, 2026

Initial plan
Copilot
committed
Rename Advanced_Readme.md to README_ADVANCED.md and address documentation feedback

Copilot
and
BigLep
committed
Fix code review findings: clarify ISO8601 format, remove timing inconsistencies, fix build prereqs

Copilot
and
BigLep
committed