docs: update doc homepage

Author: jhamman

docs/index.rst

@@ -9,25 +9,23 @@ Zarr-Python
     :hidden:
 
     quickstart
+    about
     user-guide/index
     api/index
-    release
-    contributing
-    roadmap
-    installation
+    developers/index
+    developers/release
 
 **Version**: |version|
 
-**Download documentation**: `PDF/Zipped HTML <https://readthedocs.org/projects/zarr/downloads/>`_
-
-**Useful links**:
-`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/>`_ |
-`Zarr specifications <https://zarr-specs.readthedocs.io>`_
+Zarr is a storage format for chunked, compressed, N-dimensional arrays based on an open-source specification. Highlights include:
 
-Zarr is a file storage format for chunked, compressed, N-dimensional arrays based on an open-source specification.
+* Create N-dimensional arrays with any NumPy dtype.
+* Chunk arrays along any dimension.
+* Compress and/or filter chunks using any NumCodecs_ codec.
+* Store arrays in memory, on disk, inside a Zip file, on S3, ...
+* Read an array concurrently from multiple threads or processes.
+* Write to an array concurrently from multiple threads or processes.
+* Organize arrays into hierarchies via groups.
 
 .. grid:: 2
 
@@ -85,21 +83,33 @@ Zarr is a file storage format for chunked, compressed, N-dimensional arrays base
             :color: dark
             :click-parent:
 
-            To the api reference guide
+            To the API reference guide
 
     .. grid-item-card::
         :img-top: _static/index_contribute.svg
 
-        Contributor's Guide
-        ^^^^^^^^^^^^^^^^^^^
+        Developer's Guide
+        ^^^^^^^^^^^^^^^^^
 
-        Want to contribute to Zarr? We welcome contributions in the form of bug reports, bug fixes, documentation, enhancement proposals and more. The contributing guidelines will guide you through the process of improving Zarr.
+        Want to contribute to Zarr? We welcome contributions in the form of bug reports,
+        bug fixes, documentation, enhancement proposals and more. The contributing
+        guidelines will guide you through the process of improving Zarr.
 
         +++
 
-        .. button-ref:: contributing
+        .. button-ref:: developers/index
             :expand:
             :color: dark
             :click-parent:
 
-            To the contributor's guide
+            To the developers's guide
+
+**Useful links**:
+`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/>`_ |
+`Zarr specifications <https://zarr-specs.readthedocs.io>`_
+
+**Download documentation**: `PDF/Zipped HTML <https://readthedocs.org/projects/zarr/downloads/>`_
+
+.. _NumCodecs: https://numcodecs.readthedocs.io