fix(guide): simplify directory structure

guide/english/csharp/linq/count/index.md

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+---
+title: Count
+---
+ # Any
+ Returns a count of elements in the sequence that satisfy a condition.
+ ### Signature
+```csharp
+Enumerable.Count<TSource> Method (IEnumerable<TSource>, Func<TSource, Boolean>)
+```
+ ## Example
+```csharp
+var fruits = new List<Fruit>() {
+    new Fruit() { Id = 1, Name = "Orange",     Color = "Orange", Quantity: 3   },
+    new Fruit() { Id = 2, Name = "Strawberry", Color = "Red",    Quantity: 12  },
+    new Fruit() { Id = 3, Name = "Grape",      Color = "Purple", Quantity: 25  },
+    new Fruit() { Id = 4, Name = "Pineapple",  Color = "Yellow", Quantity: 1   },
+    new Fruit() { Id = 5, Name = "Apple",      Color = "Red",    Quantity: 5   },
+    new Fruit() { Id = 6, Name = "Mango",      Color = "Yellow", Quantity: 2   }
+};
+ // Count of Fruit with Color Red.
+var yellowCount = fruits.Count(f => f.Color == "Red"); // 2
+ // Count of Fruit with Quantity > 2
+var quantityOverTwo = fruits.Count(f => f.Quantity > 2); // 4
+```