Add warning not to create or activate a Python virtual environment (#…

…1790)

docs/_inc/_install-python-plone60.md

@@ -2,3 +2,10 @@ Installing Python is beyond the scope of this documentation.
 However, it is recommended to use a Python version manager, {term}`pyenv`, that allows you to install multiple versions of Python on your development environment without destroying your system's Python.
 
 Plone 6.0 requires Python version {{SUPPORTED_PYTHON_VERSIONS_PLONE60}}.
+
+```{warning}
+Do not create or activate a Python virtual environment.
+Doing so may cause installation errors.
+Let the tools handle this for you.
+Additionally the commands in this guide use explicit paths to packages.
+```

docs/_inc/_install-python-plone61.md

@@ -1,5 +1,11 @@
 Installing Python is beyond the scope of this documentation.
 However, it is recommended to use a Python version manager, {term}`pyenv`, that allows you to install multiple versions of Python on your development environment without destroying your system's Python.
-% TODO: uncomment this line after upgrading to plone-sphinx-theme and latest Sphinx which supports replacements inside includes.
 
 Plone 6.1 requires Python version {{SUPPORTED_PYTHON_VERSIONS_PLONE61}}.
+
+```{warning}
+Do not create or activate a Python virtual environment.
+Doing so may cause installation errors.
+Let the tools handle this for you.
+Additionally the commands in this guide use explicit paths to packages.
+```