Extend api switcher so it always displays the current section.

Extend api switcher so it always displays the current section and adds 'Audience' as an option above the search field.

All sections:

• Dashboard
• Audience (should also be added as an item of the api switcher, above search field; not included in search)
• Specific API (Already implemented)
• Account
• Personal Settings
• Preferences
• Documentation

For users who can see 1 service:

• show the switcher
• hide the search box

https://sketch.cloud/s/grpla/9p8wMn/play