Fix broken link from Docker page to upgrading page (#3794)

I think this was broken in dbf23fa.

Also remove link from header, seems redundant.

website/docs/installation/docker.md

@@ -91,6 +91,6 @@ This setup is recommended only if you are running TeslaMate **on your home netwo
 2. Sign in with your Tesla Account
 3. The Grafana dashboards are available at [http://your-ip-address:3000](http://localhost:3000). Log in with the default user `admin` (initial password `admin`) and enter a secure password.
 
-## [Update](../upgrading.mdx)
+## Update
 
-To update the running TeslaMate configuration to the latest version, follow: [Upgrading to a new version](../maintenance/upgrading.mdx)
+To update the running TeslaMate configuration to the latest version, follow: [Upgrading to a new version](../upgrading.mdx)