add animation to the docs landing site

docs/templates/index.html.jinja2

@@ -32,10 +32,15 @@
     <div style="padding-top: 2em">
         <h2>What is PyMPDATA?</h2>
         <p>
-            PyMPDATA is a <b>Numba-accelerated</b> Pythonic implementation of the <b>MPDATA algorithm</b>
-            of <a href="https://doi.org/10.1016/0021-9991(84)90121-9">Smolarkiewicz et al.</a> used in geophysical fluid dynamics and beyond for
-            <b>numerically solving generalised convection-diffusion PDEs</b>. PyMPDATA supports integration in 1D, 2D and 3D structured meshes
-            with optional coordinate transformations.
+            <img align="right" src="https://github.com/open-atmos/PyMPDATA-MPI/releases/download/latest-generated-plots/n_iters.3_rank_0_size_1_c_field_.0.5.0.25._mpi_dim_0_n_threads_3-CartesianScenario-anim.gif">
+            PyMPDATA is a <b><a href="https://numba.pydata.org">Numba-accelerated</a></b> <mark>multi-threaded</mark> Pythonic implementation of the 
+            <b>MPDATA algorithm</b> of <a href="https://doi.org/10.1016/0021-9991(84)90121-9">Smolarkiewicz et al.</a> used in 
+            <mark>geophysical fluid dynamics</mark> and beyond for
+            <b>numerically solving generalised <mark>convection-diffusion PDEs</mark></b>.
+            PyMPDATA supports integration in 1D, 2D and 3D structured meshes
+              with optional coordinate transformations.
+            The animation shown depicts a "hello-world" 2D advection-only simulation
+              with dotted lines indicating <mark>domain decomposition</mark> across three threads.
         </p>
         <p>
             A separate project called <b><a href="https://github.com/open-atmos/PyMPDATA-MPI">PyMPDATA-MPI</a></b> depicts how