feat: Graph 7. Churn insight

[leopensaa]

💡 Goal

Show the volume of unique buyers and repeat buyers.

🤝 Acceptance Criteria

• [x] keep table display
• [x] number of purchases made per customer (highlight the 96.9%)
• [x] change column names to “Order count”, “Costumers” and “Costumers percentage”, respectively
• [x] add “%” sign to Customers percentage and decrease to a decimal
• [x] add "." to the thousands in the Customers column
• [x] exclude the data that are ≥5 purchases, as they are very isolated cases of few customers

See the Notion reference with pictures as example.

[felipesaldata]

Final AC gets completed by saving the dataframe head like this:

customer_counter.head(5)