Add empty state screens for new neighborhoods

[raggopaluni]

Description

When no content exists show inviting empty state not blank screen.

Empty states:

• No products: "Be the first to recommend a product here"
• No services: "Know a great pro? Let us know via feedback"
• New neighborhood: "NeighborPickd is coming soon. Want to be first Champion?"

Neighborhood name dynamically inserted.

Acceptance Criteria

• Empty state for no products
• Empty state for no services
• Neighborhood name dynamic
• Feedback button in empty state
• No blank white screens ever

Dependencies

Issue #16