Decouple HTML to PDF logic from saving functionality for improved flexibility

[tpkee]

Sometime I need to customise the pdf instance further instead of saving it directly, or outright open it in a new tab as a preview. This PR decouples the HTML to PDF conversion logic from the saving function to enable retrieving the converted PDF result for additional manipulation, rather than direct saving.

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[zoey-kaiser]

Hi @tpkee 👋

Thanks for your contribution. I just made a new release with our changes. You can pull them in version 0.1.2 https://www.npmjs.com/package/@sidebase/nuxt-pdf