Renders a bar chart with D3 — a non-Lit dependency —
vendored from npm and served by web-modules.
cargo run -p d3
# open http://127.0.0.1:8080/It shows the toolchain isn't Lit-specific: D3 ships a UMD bundle, loaded as a
classic global <script> (no import-map entry), while web/chart.ts is
transformed to JS on the fly. web/web_modules/ is generated.