Update Debian repo signing key location

Signed-off-by: Matthew Fox <matt@getbalto.com>

docs/install.md

@@ -95,7 +95,7 @@ Members of the Helm community have contributed a [Helm
 package](https://helm.baltorepo.com/stable/debian/) for Apt. This package is generally up to date.
 
 ```
-curl https://helm.baltorepo.com/organization/signing.asc | sudo apt-key add -
+curl https://baltocdn.com/helm/signing.asc | sudo apt-key add -
 sudo apt-get install apt-transport-https --yes
 echo "deb https://baltocdn.com/helm/stable/debian/ all main" | sudo tee /etc/apt/sources.list.d/helm-stable-debian.list
 sudo apt-get update