Add activity monitoring docs

docs/how-to-guides/activity-monitoring.md

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+---
+sidebar_position: 4
+---
+# Monitor system and network activity
+
+The activity monitoring feature lets you quickly see what's happening with your network. 
+Whether a new machine or user joined your network or the access control policy has been modified, the activity log allows you to track the changes to your network.
+
+Activity monitoring is enabled by default for every network, and you can access it in the web UI under the [Activity tab](https://app.netbird.io/activity). 
+You can also use the search bar to filter events by activity type.
+
+<p align="center">
+    <img src="/docs/img/how-to-guides/activity-monitoring.png" alt="activity-monitoring" width="800" style={{boxShadow: '0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19)'}} />
+</p>
+
+:::info
+The current version of NetBird tracks network changes that occur in the Management server. E.g., changes related to the list of peers, groups, system settings, setup keys, access control, etc.
+The future versions will support connection events that occur in NetBird agents (e.g., peer A connected to peer B).
+:::
+
+## Get started
+<p float="center" >
+    <button name="button" className="button-5" onClick={() => window.open("https://netbird.io/pricing")}>Use NetBird</button>
+</p>
+
+- Make sure to [star us on GitHub](https://github.com/netbirdio/netbird)
+- Follow us [on Twitter](https://twitter.com/netbird)
+- Join our [Slack Channel](https://join.slack.com/t/netbirdio/shared_invite/zt-vrahf41g-ik1v7fV8du6t0RwxSrJ96A)
+- NetBird [latest release](https://github.com/netbirdio/netbird/releases) on GitHub