Add Plotly capabilities to gallery examples

[germa89]

Description of the feature

Currently the plotly widgets are not supported (white empty box).

Steps for implementing the feature

Probably there is some interesting information in:

• https://github.com/plotly/plotly-sphinx-gallery
• https://github.com/ansys/ansys-sphinx-theme/pull/76

This issue might be not PyMAPDL, but ansys-sphinx-theme especific.

Useful links and references

• https://github.com/ansys/ansys-sphinx-theme