Update theme as well

Author: tmcw

package.json

@@ -17,7 +17,7 @@
     "debounce": "^1.0.0",
     "disparity": "^2.0.0",
     "doctrine": "^0.7.1",
-    "documentation-theme-default": "2.2.1",
+    "documentation-theme-default": "2.2.3",
     "documentation-theme-utils": "^1.2.1",
     "events": "^1.1.0",
     "extend": "^3.0.0",