Implementation of backend plotting for convergence_plot (#647)

* Implementation of grid plot functions for plotly and matplotlib

* Refactor convergence_plot to use backend plotting

Author: r3kste

docs/source/conf.py

@@ -173,6 +173,7 @@
 nb_execution_mode = "force"  # "off", "force", "cache", "auto"
 nb_execution_allow_errors = False
 nb_merge_streams = True
+nb_scroll_outputs = True
 
 # Notebook cell execution timeout; defaults to 30.
 nb_execution_timeout = 1000

docs/source/how_to/how_to_change_plotting_backend.ipynb

@@ -38,6 +38,10 @@
     "\n",
     "The returned figure object is a [`matplotlib.axes.Axes`](https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.html).\n",
     "\n",
+    "```{note}\n",
+    "In case of grid plots (such as `convergence_plot` or `slice_plot`), the returned object is a 2-dimensional numpy array of `Axes` objects: [`numpy.ndarray`](https://numpy.org/doc/stable/reference/generated/numpy.ndarray.html)[[`matplotlib.axes.Axes`]](https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.html) of shape `(n_rows, n_cols)`.\n",
+    "```\n",
+    "\n",
     ":::\n",
     "\n",
     "::::"