Add ListItem styles for various list usages

[mikemurray]

Type: minor

Describe the bug

There are 3 distict list item styles needed for the various navigation lists

Types of ListItems

Standard List items

Resting/not selected

• Standard text styles
• transparent background

Hovered

• Standard text styles
• Blue hover background

Selected

• Bold primary text
• Blue selected background

zpl.io/agdQrzQ

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Card-based list items

Resting/not selected

• Standard text styles
• transparent background

Hovered

• Standard text styles
• Card like styles. white background/drop-shadow

Selected

• Bold primary text
• transparent background

zpl.io/VqXZvGY

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Main navigation

Resting/not selected

• Standard text styles
• transparent background

Hovered

• Standard text styles
• Dark background

Selected

• Bold primary text
• transparent background