Documentation fixes from develop (#326)

* Fixing merge conflicts

* Update index.rst

Author: saadrahim

README.md

@@ -9,7 +9,7 @@ Thrust is a parallel algorithm library. This library has been ported to [HIP](ht
 ### Software
 
 * CMake (3.5.1 or later)
-* AMD [ROCm](https://rocm.github.io/install.html) platform (1.8.0 or later)
+* AMD [ROCm](https://rocm.docs.amd.com) platform (1.8.0 or later)
   * Including [HipCC](https://github.com/ROCm-Developer-Tools/HIP) compiler, which must be
     set as C++ compiler on ROCm platform.
 * [rocPRIM](https://github.com/ROCmSoftwarePlatform/rocPRIM) library

docs/.sphinx/_toc.yml.in

@@ -6,18 +6,7 @@ root: index
 subtrees:
 - caption: Setup
   entries:
-  - file: setup/requirements
-  - file: setup/cmake_options
   - file: setup/installing
 - caption: API
   entries:
   - file: cpp_api
-- caption: Releases
-  entries:
-  - file: releases/versioning
-  - file: releases/releases
-- caption: Contributing
-  entries:
-  - file: contributing/contributing
-  - file: contributing/submitting_a_pr
-  - file: contributing/release_process