Fix link to the docs - point to Symfony docs URL

Co-authored-by: Ryan Weaver <[email protected]>

Author: bocharsky-bw

README.md

@@ -9,4 +9,4 @@ tags needed.
 [Read the documentation][2]
 
 [1]: https://symfony.com/doc/current/frontend.html
-[2]: https://github.com/symfony/webpack-encore-bundle/blob/main/doc/index.rst
+[2]: https://symfony.com/bundles/WebpackEncoreBundle/current/index.html