Removed duplicate entries in imported/index, subclasses automatically shown

Author: brendanreardon

docs/source/concepts/imported/index.rst

@@ -3,42 +3,37 @@
 Imported Data Types & Classes
 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@
 
-The following data types classes are used by Cat-VRS but maintained by either the VRS subgroup
-or across the GKS Work Stream as core data classes.
+The following data types classes are used by Cat-VRS but maintained by either the `VRS subgroup <https://vrs.ga4gh.org>`_
+or across the `GKS Work Stream as core data classes <https://github.com/ga4gh/gks-core>`_.
 
 VRS
 !!!
 
 .. toctree::
    :titlesonly:
 
-   Variation
    Allele
    CopyNumberCount
    CopyNumberChange
-   Location
-   SequenceExpression
-   SequenceLocation
-   SequenceReference
-   LiteralSequenceExpression
-   ReferenceLengthExpression
-   LengthExpression
    Expression
+   Location
    Range
+   SequenceExpression
    Terminus
+   Variation
 
 GKS Core
 !!!!!!!!
 
 .. toctree::
    :titlesonly:
 
-   Entity
+   Coding
+   ConceptMapping
+   ConceptSet
    Element
+   Entity
    Extension
    MappableConcept
-   ConceptMapping
-   ConceptSet
-   Coding
    code
    iriReference