docs(slot): update instance tiers and pricing table

Simplified the pricing table by removing outdated tiers ("Common" and "Insane").
Adjusted descriptions and aligned the format to reflect the current structure effective July 1st.

Author: steebchen

src/pages/slot/scale.md

@@ -12,14 +12,12 @@ To prepare your deployments for production, you can set up billing and upgrade t
 
 ## Instances
 
-| Tier      | Description                       | Storage | Old cost  | Cost from July 1st |
-|-----------|-----------------------------------|---------|-----------|--------------------|
-| Basic     | First 3 are free. for dev & tests | 1GB     | $3/month  | $10/month          |
-| Common    | (removed)                         | auto    | $15/month | –                  |
-| Pro       | 2 vCPU and 4GB RAM                | auto    | -         | $50/month          |
-| Epic      | 4 vCPU and 8GB RAM                | auto    | $15/month | $100/month         |
-| Legendary | 8 vCPU and 16GB RAM               | auto    | $35/month | $200/month         |
-| Insane    | (removed)                         | auto    | $50/month | -                  |
+| Tier      | Description                       | Storage | Cost       |
+|-----------|-----------------------------------|---------|------------|
+| Basic     | First 3 are free. for dev & tests | 1GB     | $10/month  |
+| Pro       | 2 vCPU and 4GB RAM                | auto    | $50/month  |
+| Epic      | 4 vCPU and 8GB RAM                | auto    | $100/month |
+| Legendary | 8 vCPU and 16GB RAM               | auto    | $200/month |
 
 Note: basic instances are scaled down automatically after a few hours of no activity. To revive deployments, simply send a single request to the instance URL, and it'll be revived on the spot. If unused without any activity for more than 30 days, it will get deleted.