feat: PWA deployment guide for app built with Vanilla JS Browser-Native Web Component API

### Describe Problem

These is no guide on how to deploy as a PWA an app built with neither Angular, nor React, nor Vue but just Vanilla JS and the [Web Component API](https://developer.mozilla.org/en-US/docs/Web/API/Web_components) provided directly by web browsers.

However, looking at the guides for React and Vue it seems that the option using the Vite plugin vite-plugin-pwa are eerily familiar.
Does this plugin work as well for no framework Vanilla JS app?

Since there is no --type=vanilla options available neither for the Ionic CLI init and start commands, should I infer that to reuse Ionic components and Ionic CSS utilities in a Vanilla JS app, one should scaffold the app directly with Vite rather than with the Ionic CLI?

### Describe Preferred Solution

_No response_

### Describe Alternatives

_No response_

### Additional Information

_No response_

Start by comparing the existing React and Vue PWA guides, then check how vite-plugin-pwa applies to a Vanilla JS Web Component app. Review the Ionic CLI init and start commands and the absence of a vanilla option. Done means documenting the supported deployment path and how to scaffold an app that reuses Ionic components and CSS utilities.

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