Moved config.ftl up a level, so that it is available for both imos *and*...

... aodn namespaces.

There are many aodn layers which reference this config, but it was missing (probably since a few migrations here and there).  The effect was the any `GetFeatureInfo` requests would return an 500 Internal Server Error - which is in turn showing up as "no features at location" on the portal.

This fixes the DSTO layer reported at https://github.com/aodn/aodn-portal/issues/1160 (and many others not reported or visible in portal 2).