Update Live Monitoring link (#763)

* Update Live Monitoring link

Updated Live Monitoring link to point to the feature in the docs page, as the previous page has gone missing.

Signed-off-by: Daniel Edgar <d.edgar@f5.com>

* linter suggestion

Co-authored-by: oseoin <oseoin@users.noreply.github.com>
Signed-off-by: Daniel Edgar <d.edgar@f5.com>

---------

Signed-off-by: Daniel Edgar <d.edgar@f5.com>
Co-authored-by: oseoin <oseoin@users.noreply.github.com>

Author: aknot242

README.md

@@ -24,9 +24,9 @@ NGINX Prometheus exporter makes it possible to monitor NGINX or NGINX Plus using
 page](https://nginx.org/en/docs/http/ngx_http_stub_status_module.html#stub_status). [NGINX
 Plus](https://www.nginx.com/products/nginx/) provides a richer set of metrics via the
 [API](https://nginx.org/en/docs/http/ngx_http_api_module.html) and the [monitoring
-dashboard](https://www.nginx.com/products/nginx/live-activity-monitoring/). NGINX Prometheus exporter fetches the
-metrics from a single NGINX or NGINX Plus, converts the metrics into appropriate Prometheus metrics types and finally
-exposes them via an HTTP server to be collected by [Prometheus](https://prometheus.io/).
+dashboard](https://docs.nginx.com/nginx/admin-guide/monitoring/live-activity-monitoring/). NGINX Prometheus exporter
+fetches the metrics from a single NGINX or NGINX Plus, converts the metrics into appropriate Prometheus metrics types
+and finally exposes them via an HTTP server to be collected by [Prometheus](https://prometheus.io/).
 
 ## Getting Started