Installation and usage of ES module without bundlers

[o-alquimista]

The documentation is missing these instructions, but hopefully this will help others:

1. From any of the CDN repositories, obtain the chart.esm.js module and the chunks/ directory, then organize them like this in a directory I'm naming chartjs/:

chartjs/
--> chart.esm.js
--> chunks/
----> helpers.segment.js

2. Import the ESM file and register all the registerables

import { Chart, registerables } from './chartjs/chart.esm.js';

Chart.register(...registerables);
// now you can use it...

Without the chunks/ directory, the import will fail. That's the non-obvious thing here.

Ideally, this should be added to the documentation.