Added windows support in install Plone with pip docs

[pranshustuff]

Description

I made this contributing as I was trying to install Plone with pip on my Windows laptop to test its feature. These are fixes to errors I faced along the way.

The command venv/bin/ is for Linux/MacOS

For Windows it is .\venv\Scripts

Plus I was facing issues with pipx run cookie cutter.
If you're already in a venv, you can install cookiecutter with pip, so I added instructions for that.

Page which was modified

https://6.docs.plone.org/admin-guide/install-pip.html

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📚 Documentation preview 📚: https://plone6--1858.org.readthedocs.build/admin-guide/install-pip.html

[boring-cyborg]

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Welcome to the Plone community! 🎉

[stevepiercy]

@pranshustuff did you use Windows Subsystem for Linux (WSL) on Windows or Windows alone?

I'm hesitant to recommend installation steps for Windows alone if they don't actually result in a functional Plone site, and I have no way to verify that. See the Important admonition at https://6.docs.plone.org/install/create-project-cookieplone.html#prerequisites-for-installation.

If you used WSL, then we might want to include that admonition into the pip installation docs.

[pranshustuff]

I used Windows only.
I understand your concerns, since I have only created a basic site, I can't guarantee the working of more advanced features.

I can add the admonition instead.

Although, I would like to leave in the activation of venv and installation of cookiecutter through pip directly instead of pipx as an alternative, since my issue with pipx was with something to do with file path, which I assume can happen with WSL too. I can write a WSL version for those.

[stevepiercy]

I'm on the fence about adding commands for Windows for this installation method until and unless we have feedback confirming that a fully functional Plone site is running.

If we do go about it, then I would prefer to use Sphinx Design's synchronized tabs to better display the options, as in this example, with Linux as the default selected tab.

[pranshustuff]

I am closing the pull request and moving this discussion to the forums.

Thank you for your time and guidance! I learnt a lot today.