Fix links in docs (#532)

* fix links in amdsmi_cli/README.md
* fix xrefs to install docs
* rm rocm-smi examples and add cli tutorial
* rm disclaimer and add amd smi contributing guidelines to index

Signed-off-by: Peter Park <Peter.Park@amd.com>

docs/sphinx/_toc.yml.in

@@ -48,8 +48,8 @@ subtrees:
   entries:
   - url: https://github.com/ROCm/amdsmi/tree/amd-staging/example
     title: AMD SMI examples (GitHub)
-  - url: https://github.com/ROCm/rocm_smi_lib/tree/amd-staging/example
-    title: ROCm SMI lib examples (GitHub)
+  - url: https://rocm.blogs.amd.com/software-tools-optimization/amd-smi-overview/README.html
+    title: AMD SMI CLI walkthrough
 
 - caption: About
   entries: