move doc to NATS repo (#209)

* move doc to NATS repo

* adjust sidebar

docs/user/10-nats-server-system-events.md

@@ -0,0 +1,26 @@
+# Acquiring NATS server system account credentials
+
+## Context
+
+Accessing certain resources in NATS requires [`system_account` privileges](https://docs.nats.io/running-a-nats-service/configuration/sys_accounts). Kyma automatically generates a `system account` user using a Secret dubbed `eventing-nats-secret` in the `kyma-system` Namespace.
+
+## Procedure
+
+To acquire the credentials, run the following command:
+
+```bash
+kubectl get secrets -n kyma-system eventing-nats-secret -ogo-template='{{index .data "resolver.conf"|base64decode}}'| grep 'user:' | tr -d '{}'
+```
+
+### Result: 
+You get the credentials for the `system account` user in the following format:
+```bash
+user: admin, password: <your password>
+```
+### Next steps:
+1. To access the NATS server with the [nats-cli tool](https://github.com/nats-io/natscli), forward its port:
+   ```bash
+   kubectl port-forward -n kyma-system svc/eventing-nats 4222
+2. To send your NATS commands, pass the credentials:
+   ```bash
+   nats server info --user admin --password <your password>

docs/user/_sidebar.md

@@ -1,4 +1,4 @@
-- [Home](/)
-- [NATS Manager](README.md)
-- [Module Lifecycle](01-manager.md)
-- [Module Configuration](02-configuration.md)
+- [NATS Manager](/docs/user/README.md)
+- [Module Lifecycle](/docs/user/01-manager.md)
+- [Module Configuration](/docs/user/02-configuration.md)
+- [Acquiring NATS server system account credentials](10-nats-server-system-events.md)