Fix index page typo

Co-authored-by: Josh Moore <[email protected]>

Author: dstansby

docs/index.rst

@@ -25,7 +25,7 @@ Zarr-Python
 `Installation <installation.html>`_ |
 `Source Repository <https://github.com/zarr-developers/zarr-python>`_ |
 `Issue Tracker <https://github.com/zarr-developers/zarr-python/issues>`_ |
-`Zulip Chat <https://ossci.zulipchat.com/>`_
+`Zulip Chat <https://ossci.zulipchat.com/>`_ |
 `Zarr specifications <https://zarr-specs.readthedocs.io>`_
 
 Zarr is a file storage format for chunked, compressed, N-dimensional arrays based on an open-source specification.