Update tutorials documentation

Author: tharun571

docs/source/fibonacci.png

@@ -2,12 +2,12 @@ Tutorials
 ---------
 
 This tutorial emphasises the abilities and usage of Xeus-cpp. Let's get
-started! The tutorial demonstrates examples of C++ and C++-python integration
+started! The tutorial demonstrates examples of C++
 on Jupyter kernels.
 
 1. Install the xeus-cpp from source using conda-forge for fetching dependencies.
 
-2. Launch the Jupyter Notebook with C++-14, C++-17 kernels available.
+2. Launch the Jupyter Notebook with C++-11, C++-14, C++-17 kernels available.
 
 3. In a code cell, write the C++ code.
 
@@ -17,53 +17,17 @@ on Jupyter kernels.
 C++
 ===
 
-.. image:: sum.png
+.. image:: fibonacci.png
    :width: 200px
    :height: 100px
-   :scale: 250 %
+   :scale: 300 %
    :align: center
 
 In this example, you can modify the code and execute the cell again to see the
-updated results. For example, you might change the values of `a` and `b`
-(function arguments) of the function `sum` to see expected output. You can try
+updated results. For example, you might change the values of `n``
+(function arguments) of the function `nthFibonacci` to see expected output. You can try
 out different examples to explore the features of C++.
 
 The output of the cell will be displayed below once the code is executed and
 xeus-cpp provides an interactive environment, where you can promptly make
 the changes and prototype in C++.
-
-C++-Python Integration:
-=======================
-
-.. image:: integration-demo.png
-   :width: 200px
-   :height: 100px
-   :scale: 400 %
-   :align: center
-
-In this example, we are emphasising the concept of C++-Python integration, where
-we use Python and C++ in the same session, sharing variables, scopes, and features.
-Here, we have used variables (`new_var1`, `new_var2`, `new_var3`)
-in python which have been initialised in C++. In the following context, we have
-tried the vice versa as well of using the variables in Python (`new_python_var`)
-which have been defined in C++.
-
-.. code-block:: bash
-
-   In[1] #include <iostream>
-
-   In[2] void Cpp() {
-         std::cout << "Hello World C++!" << std::endl;
-         }
-
-   In[3] %%python
-
-   In[4] Cpp()
-
-We are taking another example of working with functions that can be used in
-to call functions defined in C++ in python code with help of magic commands.
-
-The project is under development and is subject to changes as C++-Python integration
-within the same Jupyter cell is quite challenging. Please ensure that you have
-xeus-cpp and your Jupyter environment set up before attempting to run C++
-code. The installation instructions can be found in this documentation for xeus-cpp.