Sync guide content from Google Docs and externalize image assets for GitHub-friendly maintenance#18

KoukiHama wants to merge 3 commits into

OpenChain-Project:mainOpenChain-Project/SBOM-wg:mainfrom

KoukiHama:update-sbom-quality-guide-assetsKoukiHama/SBOM-sg:update-sbom-quality-guide-assetsCopy head branch name to clipboard