Revert "chore: add resource link to cpp >> introduction:what-is-cpp"

This reverts commit 5edf7b35a9.

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+#  What is C++?
+C++ is a general-purpose programming language created by Bjarne Stroustrup as an extension of the C programming language. It was first introduced in 1985 and provides object-oriented features like classes and inheritance. C++ is widely used in various applications like game development, system programming, embedded systems, and high-performance computing.
+
+C++ is a statically-typed language, meaning that the type of a variable is determined during compilation, and has an extensive library called the C++ Standard Library, which provides a rich set of functions, algorithms, and data structures for various tasks.
+
+C++ builds upon the features of C, and thus, most C programs can be compiled and run with a C++ compiler. 
+
+## Code Example
+
+Here's a simple example of a C++ program that demonstrates some essential features of the language:
+
+```cpp
+#include <iostream>
+
+// A simple function to add two numbers
+int add(int a, int b) {
+    return a + b;
+}
+
+class Calculator {
+public:
+    // A member function to multiply two numbers
+    int multiply(int a, int b) {
+        return a * b;
+    }
+};
+
+int main() {
+    int x = 5;
+    int y = 3;
+
+    // Using the standalone function 'add'
+    int sum = add(x, y);
+    std::cout << "Sum: " << sum << std::endl;
+
+    // Using a class and member function
+    Calculator calc;
+    int product = calc.multiply(x, y);
+    std::cout << "Product: " << product << std::endl;
+
+    return 0;
+}
+```
+
+In the above program, we define a simple function `add` and a class `Calculator` with a member function `multiply`. The `main` function demonstrates how to use these to perform basic arithmetic.