diff -up ./docs/conf.py.orig ./docs/conf.py
--- ./docs/conf.py.orig	2021-03-08 21:39:15.000000000 +0100
+++ ./docs/conf.py	2021-03-21 10:49:37.793654190 +0100
@@ -78,7 +78,7 @@ pygments_style = None
 # a list of builtin themes.
 #
 # html_theme = 'alabaster'
-html_theme = 'furo'
+html_theme = 'sphinx_rtd_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -182,4 +182,4 @@ epub_title = project
 epub_exclude_files = ['search.html']
 
 
-# -- Extension configuration -------------------------------------------------
\ Pas de fin de ligne à la fin du fichier
+# -- Extension configuration -------------------------------------------------