Quick Start is missing a few steps

Description

As someone who is relatively brand-new to this, I'm trying to follow the quick start guide at https://github.com/material-components/material-web/blob/main/docs/quick-start.md

As instructed, I've installed it by running npm install @material/web, then I've created index.js. Then I add the provided HTML to a file.

That's the end of the "Usage" section, which would imply that's all one needs to do in order to use this. However, when I open the resulting HTML file Firefox tells me Uncaught TypeError: The specifier “@material/web/button/filled-button.js” was a bare specifier, but was not remapped to anything. Relative module specifiers must start with “./”, “../” or “/”.

There is a subsequent section on "Building", which appears to be relevant. It says to install rollup @rollup/plugin-node-resolve and then run npx rollup -p @rollup/plugin-node-resolve index.js -o bundle.js.

I do get visible output if I change the sample HTML file from index.js to bundle.js.

Issues

There are two issues I find:

1. The "Usage" section ends just before the interesting bit. How do I actually use it in practice?
2. The file should be called bundle.js but the "Usage" section calls it index.js

Browser/OS Environment

Browser: Firefox
OS: Windows 11

Start with docs/quick-start.md and compare the Usage and Building sections, following the documented npm install and Rollup commands in a minimal example. Verify the example in Firefox and clarify the required build step and whether the sample should reference index.js or bundle.js; done means a newcomer can follow the guide to working output.