Update HIP definition (#2134)

* Update what is hip

* Update HIP runtime page

* Update images

* Remove omnitrace

* Quick fix

* Feedback fixes

* Minor  fixes

* Update SAXPY tutorial

Signed-off-by: Jan Stephan <jan.stephan@amd.com>

---------

Signed-off-by: Jan Stephan <jan.stephan@amd.com>
Co-authored-by: Adel Johar <adel.johar@amd.com>
Co-authored-by: Jan Stephan <jan.stephan@amd.com>

projects/hip/docs/sphinx/_toc.yml.in

@@ -16,12 +16,6 @@ subtrees:
     title: Installing HIP
   - file: install/build
     title: Building HIP from source
-  - url: https://rocm.docs.amd.com/projects/install-on-linux/en/${branch}/reference/system-requirements.html
-    title: Linux supported AMD GPUs
-  - url: https://rocm.docs.amd.com/projects/install-on-windows/en/${branch}/reference/system-requirements.html
-    title: Windows supported AMD GPUs
-  - url: https://developer.nvidia.com/cuda-gpus
-    title: NVIDIA supported GPUs
 
 - caption: Programming guide
   entries: