Update Section Heading component

[ed-eva]

• On smaller screens items stack top to bottom from the left to right.
• When an item is attached to the title text (i.e. a badge or counter) it sticks/aligns to the top line of text when the text breaks to multiple lines.
• All Section Headings have a 2px border underline.
• The border underline fills the container width (minus padding)

Zeplin link: https://zpl.io/O0Ypvgk