ConfigField and related fields link to lsst-config
ConfigField and related fields link to lsst-config

The lsst-config directive marks up standalone config topic pages. Now
the config fields that point to these standalone config types can link
to those config topic pages rather than the API reference pages for
config types.

lsst-sqre/documenteer,lsst-sqre/documenteer,lsst-sqre/sphinxkit