Update to the Examples Documentation

[abhishekchitwar]

Description of the modifications

• Update the latest PyAnsys Documentation Theme
• Change the “Simulation Example” title to “Miscellaneous Examples”
• Update the TOC Tree w.r.t to title
• Add a button for return back to PyFluent Example Page (https://fluent.docs.pyansys.com/version/stable/examples/index.html)

Useful links and references

PyFluent Examples Page link: https://fluent.docs.pyansys.com/version/stable/examples/index.html