docs: wipe all documentation for clean reference-docs rewrite #214

Job	Run time
Semgrep (SAST)	23s
Gitleaks (secret scan)	13s
Trivy (filesystem + container scan)	20s
jscpd (duplication < 3% on touched code)	15s
SBOM (SPDX + CycloneDX)	16s
OSV-Scanner (SCA)	7s
	1m 34s

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