Hotfix/383 update todos

[johnrobertmcc]

Linked to #383

Description

Updates:

• isLinkActive function
• Converts ExitPreview to an atomic component
• Removes old todos

TODOS Left to address:

• connector.js -> figure out how to combine multiple type defs (i.e., WP and other APIs) and pass as single prop here.
• processGfFieldValues -> Update may be required with GraphQL Gravity Forms ^0.4.1
• AlgoliaResults.js and Search.js -> Storybook components needed, unsure how to mock data.

Screenshot

isLinkActive now checks for nested routes:

Verification

How will a stakeholder test this?

1. git checkout hotfix/383-update-todos && npm run dev
2. Go to 'blogs/nested' and check for styling on navbar
3. ExitPreview unable to be checked currently, see Preview doesn't work with nested URIs #942

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