Add latest docs link to readme (#1595)

* Add master docs link to readme

* Replace "master" with "latest"

Co-authored-by: Teymour Aldridge <42674621+teymour-aldridge@users.noreply.github.com>

Co-authored-by: Teymour Aldridge <42674621+teymour-aldridge@users.noreply.github.com>

Author: ranile

README.md

@@ -16,7 +16,9 @@
   </p>
 
   <h4>
-    <a href="https://yew.rs/docs">Documentation</a>
+    <a href="https://yew.rs/docs">Documentation (stable)</a>
+    <span> | </span>
+    <a href="https://yew.rs/docs/en/next/intro/">Documentation (latest)</a>
     <span> | </span>
     <a href="https://github.com/yewstack/yew/tree/v0.17/examples">Examples</a>
     <span> | </span>