Discover Docs Improvements - Use Cases & Best Practices

[imatwawana]

• [ ] Review existing use-cases for efficacy
• [ ] Add/update use-cases
• [ ] Rename current page: Uncover Trends With Discover to be less opaque
• [ ] Link more prominently from index page to this page (maybe add a Use Cases heading to index page)
• [ ] Add best practices either as part of Use Cases page or on its own (depending on amount of content)

Updates to Uncover Trends With Discover