Hide the "array computing" page in the navbar

Leave the content for now - it needs work, but is still valuable.
This content is also connected to the "Array libraries" tab on
the front page.

Author: rgommers

config.yaml

@@ -88,8 +88,6 @@ languages:
         url: https://numpy.org/doc/
       - title: Learn
         url: /learn
-      - title: Array computing
-        url: /arraycomputing
       - title: Community
         url: /community
       - title: About Us