Updated Bricks theme style font families

Property	Value
description	Removed the explicit Bricks theme-style heading and body font-family assignments because ACSS already owns those defaults.
stack	Bricks
variant	base
version	1.0.0
type	Update
related	Builder, Custom Fonts, Automatic.css

• Cleared the Bricks global theme-style Font family value from Body.
• Cleared the Bricks global theme-style Font family value from All headings.
• Left the HTML root font-size and the remaining theme-style typography defaults unchanged.
• Kept heading and body font-family ownership in ACSS so Bricks does not define the same starter typography twice.