Remove mentions of mapping ap

Say that we don't document how dbGaP is mapped to FHIR.
FHIR-2063

README.md

@@ -6,8 +6,6 @@ dbGaP is the Database of Genotypes and Phenotypes.<br/>
 FHIR is HL7's REST API standard for electronic medical data.
 
 - [**Quickstart**](quickstart.md)
-- [**Mapping dbGaP concepts to FHIR concepts**](https://dbgap-api-preview.ncbi.nlm.nih.gov/fhir-mapping/interactive/)
-  - Note: this mapping will be retired and replaced by alternate documentation in future
 - [**Notebooks**](jupyter)
 
 ## Prerequisites
@@ -40,8 +38,7 @@ ever come.
   If you report a bug or request a feature, it will probably be overlooked
   and neglected.
 
-- The CSV download for the interactive concept mapping does
-  not handle quoting correctly. You'll need to hand-edit it.
+- There is no documentation showing how the dbGaP submitted resources map to FHIR resources. 
 
 - If you have a query that returns after 20 seconds with an error that looks
   like the below:

quickstart.md

@@ -1,6 +1,6 @@
 # Location
 
-The dbGaP FHIR API is available at [http://dbgap-api.ncbi.nlm.nih.gov/fhir/x1](http://dbgap-api.ncbi.nlm.nih.gov/fhir/x1). It is a standard FHIR API. The documentation for FHIR is at <https://www.hl7.org/fhir/>. This guide is just a quick-start. We have documented how dbGaP concepts map to FHIR resources at [https://dbgap-api.ncbi.nlm.nih.gov/fhir-mapping/interactive](https://dbgap-api.ncbi.nlm.nih.gov/fhir-mapping/interactive).
+The dbGaP FHIR API is available at [http://dbgap-api.ncbi.nlm.nih.gov/fhir/x1](http://dbgap-api.ncbi.nlm.nih.gov/fhir/x1). It is a standard FHIR API. The documentation for FHIR is at <https://www.hl7.org/fhir/>. This guide is just a quick-start.
 
 ## Follow Along with Postman
 Postman is an API testing application you can [download for free](https://www.postman.com/downloads/).