Support pass all prerender-spa-plugin options

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We can define more options which are feed to prerender-spa-plugin not only the renderer options in .prerender-spa.json.

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Some async scripts write script tags into html and be rendered in pre-rendering. While user visit website these async scripts write twice thtese script tags. prerender-spa-plugin provides us postProcess option to cleanup the prerendered html. Need a way to configure that option.

[SolarLiner]

I’ll add the ability to specify a file to run during post-processing in the configuration. It will execute the default export of that file.

[bigsee]

@SolarLiner thank you for the work to add the postProcess option - super helpful, as is the plugin in general! 😀