DOC: Tighten ecosystem->array libraries (numpy#260)

* DOC: Tighten ecosystem->array libraries

Rewriote first sentence, trimmed rest of intro. Partly
brevity, partly because words like "newer" or "modern"
might not be clear.

Author: bjnath

layouts/partials/array-libraries.html

@@ -1,16 +1,7 @@
 <!-- Array libraries Tab Content -->
 <li class="array-libraries">
     <p>
-        When libraries emerge to exploit new
-        hardware technologies and architectures, they take
-        NumPy as their starting point.
-        <a href="https://cupy.chainer.org">CuPy</a>,
-        <a href="https://sparse.pydata.org/en/latest/">Sparse</a>, and
-        <a href="https://dask.org/">Dask</a>
-        implement the NumPy API with support for modern user cases and
-        scalable hardware;
-        <a href="https://xarray.pydata.org/en/stable/index.html">Xarray</a> and
-        <a href="http://tensorly.org/stable/home.html">Tensor.ly</a> add newer functionality.
+        NumPy's API is the starting point when libraries are written to exploit innovative hardware.
     </p>
     <table>
         <tr class="highlight-th">