docs: remove decorative icons for professional minimalist style #84

Job	Run time
Internal & External Link Validation	2m 25s
Mermaid Diagram Syntax	33s
MASTER_INDEX Navigation	4s
ADR Numbering & Status	7s
Markdown Lint & Style	20s
Sensitive Information Scan	5s
Bilingual Documentation Sync	5s
Documentation QA Report	6s
Documentation Quality Gate	3s
	3m 48s

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