Add completion percentages for each region: basic

Fun little detail to increase the gamification aspect of the whole thing. (Bigger picture: A leaderboard? Not sure I want to make it competitive, though. There should be no pressure.)

v0

### 🌍 APAC 


I have paired with `x` of the `y` possible :pear:  pairees in **APAC**. 
I have paired with `z` percent of the possible :pear:  pairees in **APAC**.

• num_paired_in_region
• total_pairees_in_region