Corrections to get build to pass

Signed-off-by: Andre Wanlin <67169551+awanlin@users.noreply.github.com>

docs/getting-started/index.md

@@ -15,7 +15,7 @@ system using tools like apt-get, npm, yarn, curl. Docker knowledge is also
 helpful for making the best use of your Backstage installation.
 
 If you are planning to contribute plugins or to the project in general, we advise
-you to use the [Contributors](contributors.md) guide to do a repository-based installation.
+you to use the [Contributors](https://github.com/backstage/backstage/blob/master/CONTRIBUTING.md) guide to do a repository-based installation.
 
 ### Prerequisites
 

mkdocs.yml

@@ -28,7 +28,6 @@ nav:
           - Customize the look-and-feel of your App: 'getting-started/app-custom-theme.md'
       - Keeping Backstage Updated: 'getting-started/keeping-backstage-updated.md'
       - Key Concepts: 'getting-started/concepts.md'
-      - Contributors: 'getting-started/contributors.md'
       - Project Structure: 'getting-started/project-structure.md'
   - Local Development:
       - CLI: