DOC: remove Processes from astronomy (#673)

Author: bsipocz

content/en/tabcontents.yaml

@@ -100,7 +100,7 @@ params:
     - title: Graphs and Networks
       alttext: A simple graph.
       img: /images/content_images/sc_dom_img/sd6.svg
-    - title: Astronomy Processes
+    - title: Astronomy
       alttext: A telescope.
       img: /images/content_images/sc_dom_img/astronomy_processes.svg
     - title: Cognitive Psychology