docs(readme): redesign README following Evolith navigation pattern #78

Job	Run time
Markdown Lint & Style	17s
Internal & External Link Validation	1m 52s
ADR Numbering & Status	5s
MASTER_INDEX Navigation	6s
Mermaid Diagram Syntax	36s
Sensitive Information Scan	6s
Bilingual Documentation Sync	5s
Documentation Quality Gate	3s
Documentation QA Report	4s
	3m 14s

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