ci: changed css variables to image from souvenirs, made image add in a single api call with updating achievements, renamed variables

src/types/level.types.ts

@@ -83,7 +83,7 @@ export interface GameAchievement {
   achievements: SteamAchievement[];
   unlockedAchievements: UnlockedAchievement[];
   updatedAt: number | undefined;
-  achievementImageUrl?: string | null;
+  imageUrl?: string | null;
   language?: string;
 }