Add accessibility blog post

Author: SylvainCorlay

_config.yml

@@ -5,6 +5,13 @@ copyright:
 
 blog:
 
+  - url: https://blog.jupyter.org/improving-the-accessibility-of-jupyter-6c695db518d3
+    title: Improving the accessibility of Jupyter
+    image: https://miro.medium.com/v2/resize:fit:4800/0*7imwXY7uST5QSNfi
+    summary: This article presents some of the recent accessibility improvements in the Jupyter Notebook codebase.
+    date: February 24th, 2023
+    authors: Nicolas Brichet, Johan Mabille, Jeremy Tuloup, Frédéric Collonval, Sylvain Corlay
+
   - url: https://blog.jupyter.org/a-jupyter-kernel-for-gnu-octave-b6d29e56341f
     title: A Jupyter kernel for GNU Octave
     image: https://miro.medium.com/max/4800/0*_HZJpXD-awr4mPDG