docs: hiding of python prompts

[sk-ip]

The python prompt >>> can be enabled or disabled. this way users can easily copy paste code in interactive sessions.
closes #438

[sk-ip]

@pdxjohnny , the only left is to add copybutton.js file to the static directory. but the static directory cannot be found. i found one in the pages directory after running ./scripts/docs.sh and it worked fine. but i don't think its the best place to add that file, since it is also getting ignored. So where should i add the copybutton.js file.

[johnandersen777]

We want ./scripts/docs.sh to download it from https://github.com/python/python-docs-theme/raw/master/python_docs_theme/static/copybutton.js (if it doesn't exist already in some directory, sounds like maybe _static, you'll want to figure out where _static is supposed to go) and then patch it with any needed adjustments for the read the docs theme (which may or may not be needed, you'll need to read the thread and test it out until it works.

[sk-ip]

@pdxjohnny , i added a link to download the copybutton.js file to the path pages/_static and then ran ./scripts.docs.sh and it worked : )
here's how it looks

[sk-ip]

@pdxjohnny , this is ready for review. i don;t know why some tests are failing.

[johnandersen777]

Nice!!