chore: create css highlights

[mikesmithgh]

-- CSS cssBraces = { link = "GruvboxBlue" }, cssFunctionName = { link = "GruvboxYellow" }, cssIdentifier = { link = "GruvboxOrange" }, cssClassName = { link = "GruvboxGreen" }, cssColor = { link = "GruvboxBlue" }, cssSelectorOp = { link = "GruvboxBlue" }, cssSelectorOp2 = { link = "GruvboxBlue" }, cssImportant = { link = "GruvboxGreen" }, cssVendor = { link = "GruvboxFg1" }, cssTextProp = { link = "GruvboxAqua" }, cssAnimationProp = { link = "GruvboxAqua" }, cssUIProp = { link = "GruvboxYellow" }, cssTransformProp = { link = "GruvboxAqua" }, cssTransitionProp = { link = "GruvboxAqua" }, cssPrintProp = { link = "GruvboxAqua" }, cssPositioningProp = { link = "GruvboxYellow" }, cssBoxProp = { link = "GruvboxAqua" }, cssFontDescriptorProp = { link = "GruvboxAqua" }, cssFlexibleBoxProp = { link = "GruvboxAqua" }, cssBorderOutlineProp = { link = "GruvboxAqua" }, cssBackgroundProp = { link = "GruvboxAqua" }, cssMarginProp = { link = "GruvboxAqua" }, cssListProp = { link = "GruvboxAqua" }, cssTableProp = { link = "GruvboxAqua" }, cssFontProp = { link = "GruvboxAqua" }, cssPaddingProp = { link = "GruvboxAqua" }, cssDimensionProp = { link = "GruvboxAqua" }, cssRenderProp = { link = "GruvboxAqua" }, cssColorProp = { link = "GruvboxAqua" }, cssGeneratedContentProp = { link = "GruvboxAqua" },