As a product manager, I want to allow free users to add up to 3 WordPress URLs to be monitored and 10 URLs for paid users

**Context**

Adding more than 3 URLs should not be allowed for free users

**Acceptance Criteria**

- Free users will be able to add 3 URLs to the list
- After that, the button to add them will not be active anymore

**Additional information**

*Add any additional information that could help or be relevant.*
