use png image for vesting

Author: nidhi-singh02

apps/developer-hub/content/docs/pyth-token/images/PYTH_Private_Sales_Vesting_Schedule_Dark.jpg

@@ -16,8 +16,8 @@ import ProtocolDevelopmentLockupDark from "./images/PYTH_Protocol_Development_Lo
 import ProtocolDevelopmentLockupLight from "./images/PYTH_Protocol_Development_Lockup_Schedule_Light.png";
 import CommunityLaunchLockupDark from "./images/PYTH_Community_Launch_Lockup_Schedule_Dark.png";
 import CommunityLaunchLockupLight from "./images/PYTH_Community_Launch_Lockup_Schedule_Light.png";
-import PrivateSalesVestingDark from "./images/PYTH_Private_Sales_Vesting_Schedule_Dark.jpg";
-import PrivateSalesVestingLight from "./images/PYTH_Private_Sales_Vesting_Schedule_Light.jpg";
+import PrivateSalesVestingDark from "./images/PYTH_Private_Sales_Vesting_Schedule_Dark.png";
+import PrivateSalesVestingLight from "./images/PYTH_Private_Sales_Vesting_Schedule_Light.png";
 
 There is a total of 10,000,000,000 (10B) PYTH tokens existing.