Add pfSense guide (#381)

* Add pfSense installation guide

Signed-off-by: bcmmbaga <bethuelmbaga12@gmail.com>

* Move pfSense guide to installation section

Signed-off-by: bcmmbaga <bethuelmbaga12@gmail.com>

* update docs

Signed-off-by: bcmmbaga <bethuelmbaga12@gmail.com>

---------

Signed-off-by: bcmmbaga <bethuelmbaga12@gmail.com>

src/components/NavigationDocs.jsx

@@ -39,6 +39,7 @@ export const docsNavigation = [
               { title: 'Docker', href: '/how-to/installation/docker' },
               { title: 'Synology', href: '/how-to/installation/synology' },
               { title: 'Android/iOS', href: '/how-to/installation/mobile' },
+              { title: 'pfSense', href: '/how-to/installation/pfsense' },
             ],
       },
       { title: 'CLI', href: '/how-to/cli' },

src/pages/how-to/installation/pfsense.mdx

@@ -0,0 +1,92 @@
+# pfSense Installation
+
+The NetBird client (agent) allows a peer to join a pre-existing NetBird deployment. If a NetBird deployment is not yet available,
+there are both managed and [self-hosted](https://docs.netbird.io/selfhosted/selfhosted-quickstart) options available.
+
+<Note>
+This installation is intended for early adopters while the pfSense package is under review and not yet available in the pfSense package manager.
+</Note>
+
+
+## Prerequisites
+- Shell/SSH access to pfSense (via Web UI shell or remote SSH)
+- A [setup key](/how-to/register-machines-using-setup-keys#types-of-setup-keys) to authenticate and register the pfSense device
+- The latest NetBird `.pkg` binary from the [GitHub Releases](https://github.com/netbirdio/pfsense-netbird/releases)
+
+## Installation
+
+1. **SSH into your pfSense system**
+   ```sh
+   ssh admin@<pfsense-ip>
+   ```
+   If remote SSH is enabled or use the built-in shell via the pfSense Web UI (`Diagnostics` > `Command Prompt`).
+
+3. **Download the NetBird client(agent)**
+
+   From a shell on your pfSense system, run:
+   ```sh
+   fetch https://github.com/netbirdio/pfsense-netbird/releases/download/v0.1.0/netbird-0.49.0.pkg
+   ```
+3. **Download the NetBird pfSense package**
+
+   From a shell on your pfSense system, run:
+   ```sh
+   fetch https://github.com/netbirdio/pfsense-netbird/releases/download/v0.1.0/pfSense-pkg-NetBird-0.1.0.pkg
+   ```
+
+4. **Install the packages**
+
+   ```sh
+   pkg add -f netbird-0.49.0.pkg
+   pkg add -f pfSense-pkg-NetBird-0.1.0.pkg
+   ```
+
+5. **Verify the installation**
+
+   The NetBird GUI should now appear under `VPN` > `NetBird` in the pfSense menu.
+
+## Configuration
+
+### Authenticate the machine
+
+Fill out the authentication form with the following values and click `Save`:
+
+- **Management URL**: Default is `https://app.netbird.io:443`. If self-hosting, enter your custom management server URL.
+- **Setup Key**: Paste the setup key from your NetBird account. .
+
+<p>
+    <img src="/docs-static/img/how-to-guides/pfSense/authentication.png" alt="authentication" className="imagewrapper-big"/>
+</p>
+
+### Verify Connection Status
+
+The Status page shows detailed information about connected peers and control services, helping you monitor your deployment.
+Access it via `Status` > `NetBird` in the pfSense menu.
+
+Use this section for diagnostics and troubleshooting common connection or setup issues.
+
+<p>
+    <img src="/docs-static/img/how-to-guides/pfSense/status.png" alt="connection status" className="imagewrapper-big"/>
+</p>
+
+## Uninstallation
+
+From a shell on your pfSense system, run:
+<p>
+```sh
+pkg delete netbird-0.49.0 pfSense-pkg-NetBird-0.1.0
+```
+</p>
+
+
+
+
+## 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 X](https://x.com/netbird)
+- Join our [Slack Channel](/slack-url)
+- NetBird [latest release](https://github.com/netbirdio/netbird/releases) on GitHub