update README for /docs

Author: alexweissman

docs/README.md

@@ -1,12 +1 @@
-Select2 Documentation
-=====================
-[This repository][select2-docs-source] holds a redirect to the latest documentation for
-[Select2][select2].
-
-How can I fix an issue in the docs?
--------------------------------------
-Submit a pull request at [select2-new-docs][the new documentation repository].
-
-[select2]: https://select2.org
-[select2-docs-source]: https://github.com/select2/select2.github.io
-[select2-new-docs]: https://github.com/select2/docs
+Effective beginning September 10, 2017, the Select2 documentation repository is now available at [`select2/docs`](https://github.com/select2/docs).