Repository Reorganization: Directory Structure, License Consolidation, and File Cleanup

[anvega]

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This pull request includes the initial reorganization of the repository according the Information Architecture proposed, discussed, and approved by all leads to improve accessibility and maintainability. Key changes include:

• Created new directories: community/working-groups, community/events, and community/resources.
• Moved audio-versions to community/publications
• Moved supply-chain-security, compliance, and controls content to community/working-groups subdirectories and merged readmes
• Moved policy to community/working-groups/archive
• Moved design, security-lexicon, security-whitepaper, landscape, security-fuzzing-handbook to community/resources
• Moved cloud_native_security.md, and past-events.md to community/events
• Deleted unused files: policy-wg-merging.md, roadmap.md, safe_kubecon.md.
• Updated relative paths for links
• Updated a few deadlinks a different markdown files