Update for current Google Cloud documentation

[elecnix]

Update to parse the current version of Google Cloud documentation.

The code assumed an old version of the documentation, which had different CSS styles. Also, there is no sub-product navigation, so it is removed from the CLI options.

Modernized to an ES6 module instead of CommonJS. Tested on Node v20.10.0.

A very old version of Puppeteer was in use, and needed an update.

Removed cheerio which did not seem necessary, since Puppeteer can pass query selectors to the document.