[DOC] Fix sphinx add_stylesheet deprecated method

by using add_css_file instead

Issue-ID: DOC-692
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: Ib8af980dc116fc551ca180c28cfb658bb6f86299

diff --git a/docs/conf.py b/docs/conf.py
index 33552e8..296ef99 100644 (file)
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -99,7 +99,7 @@ linkcheck_ignore = [
 html_last_updated_fmt = '%d-%b-%y %H:%M'
 
 def setup(app):
-    app.add_stylesheet("css/ribbon.css")
+    app.add_css_file("css/ribbon.css")
 
 
 from docutils.parsers.rst import directives