Dev docs are broken with the new ansys-sphinx-theme

[RobPasMue]

Looks like the new ansys-sphinx-theme has broken part of our docs... Don't really know what's happenning but our left-bar does not render properly now, on the different menus.

Pinging @Revathyvenugopal162 and @jorgepiloto for visibility.

[RobPasMue]

Examples:

• https://geometry.docs.pyansys.com/version/dev/getting_started/index.html
• https://geometry.docs.pyansys.com/version/dev/examples.html
• https://geometry.docs.pyansys.com/version/dev/autoapi/ansys/geometry/core/designer/index.html

[Revathyvenugopal162]

@RobPasMue can you try take out https://github.com/pyansys/pygeometry/blob/9089f49eb8ef955be67b1f08cb03cfc2854533f0/doc/source/_static/custom.css#L3 to 14.