- docs/README.md: restructure to surface 20+ previously undiscoverable docs
- docs/README.md: fix broken github-issue-guide.md link (file was removed)
- docs/add-code-flow.md: rewrite with current code flow and mermaid diagrams
- docs/customizing.md, docs/gateway.md: use specs.ipfs.tech URLs
- README.md: fix orphan #nix anchor, use go.dev links, link to contributors graph
- remove stale docs/AUTHORS and docs/generate-authors.sh (last updated 2016)