DOC docs still mention powershell scripts that have been replaced by python scripts

[romanlutz]

Describe the issue linked to the documentation

The following links show occurrences of the (since removed in #375 ) powershell scripts in our docs.

https://github.com/search?q=repo%3AAzure%2FPyRIT+pct_to_ipynb&type=code
https://github.com/search?q=repo%3AAzure%2FPyRIT+ipynb_to_pct&type=code

Suggest a potential alternative/fix

Replace ps1 with py

[mhaoda]

I'm a quite new contributor to opensource. I want to try a simple issue at the beginning, can I work on this?

[romanlutz]

@mhaoda yes! Go ahead and feel free to ask if you have questions 🙂