Remove user agent summary arrow

[isiah-lloyd]

Browsers by default show an arrow next to <summary> elements, this is redundant for 98.css as it has it's own marker. Without disabling this marker two separate markers will be shown:

docs.css fixed this for the docs website but this is something that should be pulled up to the main stylesheet.

The rule uses the new ::marker pseduo-element which is supported by all modern browsers except for Safari which is why the vendor prefixed ::-webkit-details-marker is also included.

(Beta versions of Safari add support for ::marker so the vendor prefixed selector could be dropped in the near future)

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Name	Status	Preview	Updated
98css	✅ Ready (Inspect)	Visit Preview	May 20, 2022 at 0:37AM (UTC)

[isiah-lloyd]

Turns out setting display: none doesn't actually fix anything. The docs stylesheet had another rule for summary that set it to inline (which for some reason also gets rid of the marker). Setting the content to an empty string seems to actually remove the marker.