Add possibility to not use pagefind's CSS file

[bramsmulders]

Hi!

thanks for this awesome integration of pagefind and Astro! Setting this up is really easy 🎉
I find myself constantly overriding pagefind's CSS selectors when adjusting the styling to my own needs.
In the docs of pagefind there is a section called "Styling pagefind ui yourself" which basically says: "don't use the CSS file": https://pagefind.app/docs/ui-usage/#styling-pagefind-ui-yourself

Is it a possibility for you to make an unstyled version of your integration?

[shishkin]

Thanks for the feedback!

Omitting default styles makes sense. I currently import the CSS unconditionally, but would need to check if it's possible to do upon a config option. It should be doable, just need to ensure the solution doesn't introduce redundant imports. PRs are always welcome!