Add sphinx-llms-txt to contributing docs. (#2050)

- Fix sphinx-llms-txt warning from Sphinx

Author: stevepiercy

docs/conf.py

@@ -383,7 +383,14 @@
 todo_include_todos = True
 
 
-# -- Options for sphinx-notfound-page ----------------------------------
+# -- sphinx-llms-txt ----------------------------------
+llms_txt_exclude = [
+    "search",  # Exclude the search page
+    "genindex",  # Exclude the index page
+]
+
+
+# -- sphinx-notfound-page configuration ----------------------------------
 
 notfound_urls_prefix = ""
 notfound_template = "404.html"
@@ -409,7 +416,7 @@
 }
 
 
-# -- Options for sphinx_sitemap to HTML -----------------------------
+# -- sphinx_sitemap configuration -----------------------------
 
 # Used by sphinx_sitemap to generate a sitemap
 html_baseurl = "https://6.docs.plone.org/"

docs/contributing/documentation/themes-and-extensions.md

@@ -45,6 +45,7 @@ We use several MyST and Sphinx extensions to enhance the presentation of Plone d
 -   [`myst_parser`](https://myst-parser.readthedocs.io/en/latest/) parses MyST, a rich and extensible flavour of Markdown for authoring documentation.
 -   [`sphinx-design`](https://sphinx-design.readthedocs.io/en/latest/), with a configuration name of `sphinx_design`, adds grids, cards, icons, badges, buttons, tabs, and dropdowns.
 -   [`sphinx-examples`](https://ebp-sphinx-examples.readthedocs.io/en/latest/) adds "example snippets" that allow you to show off source Markdown and the result of rendering it in Sphinx.
+-   [`sphinx-llms-txt`](https://sphinx-llms-txt.readthedocs.io/en/stable/) generates a summary {file}`llms.txt` file and a single combined documentation {file}`llms-full.txt` file.
 -   [`sphinx-notfound-page`](https://sphinx-notfound-page.readthedocs.io/en/latest/index.html), with a configuration name of `notfound.extension`, creates a custom 404 page and helps generate proper static resource links to render the page.
 -   [`sphinx-tippy`](https://sphinx-tippy.readthedocs.io/en/latest/), with a configuration name of `sphinx_tippy`, provides hover tips in your documentation.
 -   [`sphinx.ext.autodoc`](https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html) pulls in documentation from Python docstrings to generate reStructuredText which in turn gets parsed by Sphinx and rendered to the output format.