Merge branch '6.0' into create-an-emergency-user

Author: stevepiercy

docs/_inc/_hardware-requirements.md

@@ -0,0 +1,19 @@
+The hardware requirements below give a rough estimate of the minimum hardware setup needed for a Plone server.
+
+A single Plone installation is able to run many Plone sites.
+
+-   Installation of the Plone backend and Classic UI frontend requires a minimum of 256 MB of RAM and 2GB of disk swap space.
+-   Installation of the Volto frontend requires a minimum of 2GB of RAM.
+-   After installation, running Plone requires a minimum of 256 MB RAM and 512 MB of disk swap space per Plone site.
+    2 GB or more RAM per Plone site is recommended.
+-   Minimum 512 MB hard disk space is required.
+    40 GB or more hard disk space is recommended.
+
+
+````{warning}
+{term}`Add-on` products and caching solutions may also increase RAM and disk swap space requirements.
+To avoid RAM and disk swap limitations, we recommend either temporarily resizing your remote machine to accommodate the build, or build your images locally and upload them to an image store, such as [Docker Hub](https://hub.docker.com/) or [GitHub Actions](https://github.com/features/actions).
+```{seealso}
+[How much RAM is required to build a Volto front end?](https://community.plone.org/t/how-much-ram-is-required-to-build-a-volto-front-end/17949) and [Dealing with heap exhaustion while building Volto 17 on limited-RAM host](https://community.plone.org/t/dealing-with-heap-exhaustion-while-building-volto-17-on-limited-ram-host/18078).
+```
+````

docs/_inc/_install-pillow.md

@@ -0,0 +1,24 @@
+``````{note}
+After generating a project, then running `make install`, if you see an error message `ERROR: Failed building wheel for Pillow`, then you need to install Pillow's dependencies.
+
+`````{tab-set}
+
+````{tab-item} macOS
+```shell
+brew install zlib libjpeg
+```
+````
+
+````{tab-item} Linux
+```shell
+apt-get zlib libjpeg
+```
+````
+`````
+
+You will then need to run `make install` again.
+
+```{seealso}
+See also the Pillow documentation [External Libraries](https://pillow.readthedocs.io/en/latest/installation/building-from-source.html#external-libraries) for additional libraries that you might need.
+```
+``````

docs/_inc/_install-python.md

@@ -0,0 +1,6 @@
+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 requires Python version {SUPPORTED_PYTHON_VERSIONS}.
+
+Plone requires Python version 3.8, 3.9, 3.10, 3.11, or 3.12.

docs/_static/conceptual-guides/xkcd-1987-python-environment.png

@@ -15,17 +15,17 @@ This chapter describes how to create a custom theme for Plone Classic UI based o
 Barceloneta is the default enabled theme for Plone Classic UI.
 
 
-(classic-ui-theming-barceloneta-pre-requisites-label)=
+(classic-ui-theming-barceloneta-prerequisites-label)=
 
-## Pre-requisites
+## Prerequisites
 
-To create an add-on package with a Plone Classic UI theme, you need to install the following pre-requisites.
+To create an add-on package with a Plone Classic UI theme, you need to install the following prerequisites.
 
 -   [Node.js (16/18)](https://nodejs.org/en)
 -   [Python (>=3.8)](https://www.python.org/)
 -   [plonecli](https://pypi.org/project/plonecli/)
 
-Read more about how to install pre-requisites in {doc}`/install/create-project`.
+Read more about how to install prerequisites in {doc}`/install/create-project`.
 
 
 (classic-ui-theming-barceloneta-create-a-classic-ui-theme-add-on-package-label)=

docs/_static/plone-classic-ui-landing-page.png

@@ -0,0 +1,20 @@
+---
+myst:
+  html_meta:
+    "description": "Conceptual guides provide explanation of concepts to deepen and broaden your understanding of Plone."
+    "property=og:description": "Conceptual guides provide explanation of concepts to deepen and broaden your understanding of Plone."
+    "property=og:title": "Conceptual guides"
+    "keywords": "Plone 6, Conceptual guides"
+---
+
+# Conceptual guides
+
+This part of the documentation provides explanation of concepts to deepen and broaden your understanding of Plone.
+
+
+```{toctree}
+:maxdepth: 2
+
+package-management
+make-build-backend-walk-through
+```