Update accessibility.md

Point bookmarklet at https://cdn.jsdelivr.net/gh/brucelawson/Tota11y-1/dist/tota11y.min.js, not local version (so it's always up to date)

standards/accessibility.md

@@ -44,7 +44,7 @@ We recommend [TetraLogical](https://tetralogical.com/) for accessibility testing
 ## Tota11y
 <p>Drag this bookmarklet into your bookmark bar. <a href="https://web.archive.org/web/20230106155321/https://tota11y.babylontech.co.uk/">Instructions</a>.
 
-<a style="text-justify:center; border:1px solid green; width:50%; padding:.5em; margin:1em auto;display:block;" href="javascript:(function()%7Bvar tota11y%3Ddocument.createElement(%27SCRIPT%27)%3Btota11y.type%3D%27text/javascript%27%3Btota11y.src%3D%27https://platforms.barnardos.org.uk/tota11y/tota11y.min.js%27%3Bdocument.getElementsByTagName(%27head%27)%5B0%5D.appendChild(tota11y)%3B%7D)()%3B">Tota11y2</a></p>
+<a style="text-justify:center; border:1px solid green; width:50%; padding:.5em; margin:1em auto;display:block;" href="javascript:(function()%7Bvar tota11y%3Ddocument.createElement(%27SCRIPT%27)%3Btota11y.type%3D%27text/javascript%27%3Btota11y.src%3D%27https://cdn.jsdelivr.net/gh/brucelawson/Tota11y-1/dist/tota11y.min.js%27%3Bdocument.getElementsByTagName(%27head%27)%5B0%5D.appendChild(tota11y)%3B%7D)()%3B">Tota11y2</a></p>
 
 ## Reading list