Adjustments to hero component controls panel options

[natalia-fitzgerald]

Description

In the Storybook controls panel within the Hero Story there are options available that should not be modifiable. The purpose of this issue is to highlight the options that should be changed.

Controls that should be changed

• Text color should not be a selection. isKnockout will change the text to white and is intended for instances where there is a dark background. For lighter backgrounds black is the default. No colors other than black or white should be used.

• The heading for the heroes supported in the DSR are always H1 at desktop and drop a level to match the H2 styling at mobile (standard responsive behavior for an H1).

• The subheading for the heroes always uses the hero_subhead style which includes responsive behavior. The text size of the subheading should not be customizable.