python: doc and example updates

doc/src/Python_jupyter.rst

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+Using LAMMPS in IPython notebooks and Jupyter
+=============================================
+
+If the LAMMPS Python package is installed for the same Python interpreter as
+`IPython <ipython>`_, you can use LAMMPS directly inside of an IPython notebook inside of
+Jupyter. `Jupyter <juypter>`_ is a powerful integrated development environment (IDE) for
+many dynamic languages like Python, Julia and others, which operates inside of
+any web browser. Besides auto-completion and syntax highlighting it allows you
+to create formatted documents using Markup, mathematical formulas, graphics and
+animations intermixed with executable Python code. It is a great format for
+tutorials and showcasing your latest research.
+
+The easiest way to install it is via ``pip``:
+
+.. code-block:: bash
+
+   pip install jupyter
+
+To launch an instance of Jupyter simply run the following command inside your
+Python environment:
+
+.. code-block:: bash
+
+   jupyter notebook
+
+.. _ipython: https://ipython.org/
+.. _jupyter: https://jupyter.org/
+
+Interactive Python Examples
+---------------------------
+
+Examples of IPython notebooks can be found in the ``python/examples/ipython``
+subdirectory. They require LAMMPS to be compiled as shared library with PYTHON,
+PNG, JPEG and FFMPEG support.
+
+To open these notebooks launch ``jupyter notebook index.ipynb`` inside this
+directory. The opened file provides an overview of the available examples.
+
+- Example 1: Using LAMMPS with Python (``simple.ipynb``)
+- Example 2: Analyzing LAMMPS thermodynamic data (``thermo.ipynb``)
+- Example 3: Working with Per-Atom Data (``atoms.ipynb``)
+- Example 4: Working with LAMMPS variables (``variables.ipynb``)
+- Example 5: Validating a dihedral potential (``dihedrals/dihedral.ipynb``)
+- Example 6: Running a Monte Carlo relaxation (``montecarlo/mc.ipynb``)
+
+.. note:: 
+
+   Typically clicking a link in Jupyter will open a new tab, which might be blocked by your pop-up blocker.