DOC 1.6.10 (prep)

Author: prjemian

docs/source/_static/switcher.json

@@ -4,6 +4,10 @@
         "version": "dev",
         "url": "https://bcda-aps.github.io/apstools/dev/"
     },
+    {
+        "version": "1.6.10",
+        "url": "https://bcda-aps.github.io/apstools/1.6.10/"
+    },
     {
         "name": "1.6.9 (latest)",
         "version": "1.6.9",