Merge pull request #863 from nginx/fix-links

Fix broken links causing deployment failures

Author: ADubhlaoich

site/content/contribute/dev-environment-setup.md

@@ -19,7 +19,7 @@ While most Linux or FreeBSD operating systems can be used to contribute to the N
 
 ## Install NGINX
 
-Follow the steps in the [Installation]({{< relref "/installation-github.md" >}}) section to download, install, and run NGINX and NGINX Agent.
+Follow the steps in the [Installation]({{< relref "/installation-upgrade/" >}}) section to download, install, and run NGINX and NGINX Agent.
 
 ## Clone the NGINX Agent Repository
 

site/content/installation-upgrade/getting-started.md

@@ -15,7 +15,7 @@ Follow these steps to configure and run NGINX Agent and a mock interface ("contr
 
 ## Install NGINX
 
-Follow the steps in the [Installation]({{< relref "/installation-github.md" >}}) section to download, install, and run NGINX.
+Follow the steps in the [Installation]({{< relref "/installation-upgrade/" >}}) section to download, install, and run NGINX.
 
 ## Clone the NGINX Agent Repository