Update index.md

Author: sanketverma1704

community/index.md

@@ -37,7 +37,7 @@ Check out the Zarr blog [here](https://zarr.dev/blog).
 
 Most discussions and chats related to Zarr and its [implementations](https://github.com/zarr-developers/zarr_implementations) take place on Gitter and GitHub. If you are looking to:
 
-- Interact with the maintainers, contributors and users of the project; join the Gitter → [here](https://gitter.im/zarr-developers/community)
+- Interact with the maintainers, contributors and users of the project; join the ZulipChat → [here](https://ossci.zulipchat.com/)
 - Want to ask questions related to [`zarr-python`](https://github.com/zarr-developers/zarr-python) usage, create a new discussion on GitHub → [here](https://github.com/zarr-developers/zarr-python/discussions)
 - Contribute and engage in discussion related to Zarr Specification; check out the `zarr-specs` [repo](https://github.com/zarr-developers/zarr-specs/) or create an issue → [here](https://github.com/zarr-developers/zarr-specs/issues)