docs: move contribution guide to Getting Started section (#7269)

Signed-off-by: Dan Gil <dagil@nvidia.com>
Signed-off-by: Harrison Saturley-Hall <hsaturleyhal@nvidia.com>
Co-authored-by: Harrison Saturley-Hall <hsaturleyhal@nvidia.com>

Author: dagil-nvidia

docs/index.yml

@@ -22,6 +22,8 @@ navigation:
     contents:
       - page: Quickstart
         path: getting-started/quickstart.md
+      - page: Contribution Guide
+        path: contribution-guide.md
 
   # ==================== Resources ====================
   - section: Resources