CSS Updates for 2024

[JohnRiv]

• CSS Snapshot updated from 2018 to 2023
• CSS Profiles note removed
• CSS Box Model Level 3 and CSS Counter Styles Level 3 added
• Media Queries updated from Level 3 to Level 4 with note about 'tv' media type deprecation
• Name & Link updates for existing specs: CSS Images Module Level 3, CSS Multi-column Layout Module Level 1, CSS Transitions Level 1, CSS Animations Level 1

This addresses #343

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