Move Python virtual environment into venv from root

[stevepiercy]

--clear is the recommended way to wipe and recreate a clean virtual environment. python3 -m venv venv --clear will purge files and directories, such as .git and .my_special_config, from the current directory. This would be Very Bad™.

• Enhance make distclean such that it cleans both the docs directory and the virtual environment, then recreates the virtual environment and installs requirements into it. This is useful when your project gets confused about what exactly is in your virtual environment
• Update internal Makefile command. No change to user commands.

Credit to @mrtango

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📚 Documentation preview 📚: https://plone6--1769.org.readthedocs.build/

[ksuess]

--clear is the recommended way to wipe and recreate a clean virtual environment. python3 -m venv venv --clear will purge files and directories, such as .git and .my_special_config, from the current directory. This would be Very Bad™.

:-) Funny experience when the repo content disappears on python3 -m venv . --clear!