fix: update helm repository URL

Signed-off-by: Niladri Halder <[email protected]>

README.md

@@ -1,6 +1,6 @@
 # Node Disk Manager Charts
 
-The contents of this branch (gh-pages) are published via GitHub pages at https://openebs.github.io/node-disk-manager/
+The contents of this branch (gh-pages) are published via GitHub pages at https://openebs-archive.github.io/node-disk-manager/
 
 This branch contains the following:
-- Node Disk Manager Helm Chart metadata - [index.yaml](./index.yaml). This file is auto-updated by GitHub Action - Helm Chart Releaser. Please do not modify this file.
+- Node Disk Manager Helm Chart metadata - [index.yaml](./index.yaml). This file is auto-updated by GitHub Action - Helm Chart Releaser. Please do not modify this file.

index.md

@@ -8,7 +8,7 @@ Please refer to Helm's [documentation](https://helm.sh/docs/) to get started.
 Once Helm is set up properly, add the repo as follows:
 
 ```bash
-$ helm repo add ndm https://openebs.github.io/node-disk-manager
+$ helm repo add ndm https://openebs-archive.github.io/node-disk-manager
 ```
 
 You can then run `helm search repo ndm` to see the charts.