Remove unused Reporter Components doxygen page.
Remove unused Reporter Components doxygen page.

We already have a page for the group of Reporters. We don't need an additional
"page" for reporters. The page was empty anyway.

[ci skip]

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core