docs(install): fix link to helm readme (#3869)

Author: greyscaled

docs/install.md

@@ -234,7 +234,7 @@ alternative](https://hub.docker.com/r/linuxserver/code-server).
 
 ## Helm
 
-You can install code-server via [Helm](../ci/helm-chart/README.md).
+You can install code-server via [Helm](https://github.com/cdr/code-server/blob/main/ci/helm-chart/README.md).
 
 ## Raspberry Pi