docs: add Unraid 7.3 onboarding wizard flow

docs/unraid-os/getting-started/set-up-unraid/deploy-and-configure-unraid-os.mdx

@@ -9,7 +9,7 @@ After booting Unraid OS for the first time, you'll use the %%WebGUI|web-gui%% to
 
 :::info[Localize]
 
-It may be easier for users to follow this guide after configuring their language settings.  Check out [Multi-language support](../../using-unraid-to/customize-your-experience/multi-language-support.mdx) to make the %%WebGUI|web-gui%% more accessible in your preferred language.
+It may be easier for users to follow this guide after configuring their language settings. Check out [Multi-language support](../../using-unraid-to/customize-your-experience/multi-language-support.mdx) to make the %%WebGUI|web-gui%% more accessible in your preferred language.
 
 :::
 
@@ -33,12 +33,12 @@ When you access the %%WebGUI|web-gui%% for the first time, you'll be prompted to
 Make sure your password is:
 
 - Unique
-- At least 8 characters long.  (Although, best practice recommends 12+ for the most secure passwords!)
+- At least 8 characters long. (Although, best practice recommends 12+ for the most secure passwords!)
 - A mix of letters, numbers, and special characters
 
 We recommend using a password manager for secure storage.
 
-<div style={{ margin: 'auto', maxWidth: '300px'}}>
+<div style={{ margin: "auto", maxWidth: "300px" }}>
   ![Set root password](/img/Set_root_password.png)
 </div>
 
@@ -48,27 +48,83 @@ If you forget your root password, you can reset it following the [Reset your pas
 
 :::
 
+## Onboarding
+
+:::note[Unraid 7.3 only]
+
+The onboarding wizard below applies to Unraid 7.3 and later.
+
+:::
+
+1. Press **Get Started** to launch the onboarding wizard. If you prefer to configure manually, select **Skip Setup**.
+
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
+     ![Step 1: Welcome to Unraid](/img/onboarding_step1.png)
+   </div>
+
+   To relaunch the wizard later, go to **_Settings → Onboarding Wizard_**.
+
+2. Configure your server settings, including server name and description, time zone, language, and optional SSH/theme preferences. Then click **Next**.
+
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
+     ![Step 2: Configure Settings](/img/onboarding_step2.png)
+   </div>
+
+3. Choose your boot option:
+   - For **flash boot**, keep the default USB/flash boot configuration and click **Next**.
+
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
+     ![Step 3: Flash Boot](/img/onboarding_step3a.png)
+   </div>
+   - For **internal boot**, choose single or mirrored boot mode, select the
+   device(s), and set the space reserved for the boot partition. Then click
+   **Next**.
+
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
+     ![Step 3: Internal Boot](/img/onboarding_step3b.png)
+   </div>
+
+4. Optionally choose whether to preinstall key plugins, then click **Next**.
+
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
+     ![Step 4: Plugins](/img/onboarding_step4.png)
+   </div>
+
+5. Review the summary, then click **Confirm & Apply**.
+
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
+     ![Step 5: Summary](/img/onboarding_step5.png)
+   </div>
+
+6. On the **Next Steps** screen, review the recommended follow-up actions, then click:
+   - **Go to Dashboard** if you chose flash boot
+   - **Reboot** if you chose internal boot
+
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
+     ![Step 6: Next Steps](/img/onboarding_step6.png)
+   </div>
+
 ## Register your license key
 
-After setting your root password, log in to your Unraid.net account to obtain a license key:
+Log in to your Unraid.net account to obtain a license key:
 
 1. In the %%WebGUI|web-gui%%, go to the **Get Started** section.
 
-   <div style={{ margin: 'auto', maxWidth: '500px'}}>
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
      ![Get started](/img/Upc_get_started.png)
    </div>
 
 2. Sign in or create an account, after which a trial key will be installed automatically.
 
-   <div style={{ margin: 'auto', maxWidth: '500px'}}>
+   <div style={{ margin: "auto", maxWidth: "500px" }}>
      ![Install trial key](/img/Upc_install_trial_key.png)
    </div>
 
    This process allows you to manage your Unraid OS license keys, obtain new keys, recover lost ones, or upgrade your license.
 
 :::important
 
-For details on your license, visit ***Tools → Registration*** in the %%WebGUI|web-gui%%.
+For details on your license, visit **_Tools → Registration_** in the %%WebGUI|web-gui%%.
 
 :::
 
@@ -79,35 +135,35 @@ Before deploying Unraid OS, it's important to verify your system's BIOS and stor
 <details>
   <summary>Click to expand our BIOS and Storage Controller checklist</summary>
 
-  Proper BIOS and storage controller configuration is vital for a stable Unraid OS deployment. Use this checklist before your first boot.
+Proper BIOS and storage controller configuration is vital for a stable Unraid OS deployment. Use this checklist before your first boot.
 
-  ### Basic Settings
+### Basic Settings
 
-  ✅ Set the USB flash drive as the primary boot device.\
-  ✅ Configure the storage controller to **%%AHCI|ahci%%** mode with SATA connections.\
-  ✅ Set the controller to **%%HBA mode|hba-mode%%** (not **%%RAID|raid%%**).\
-  ✅ Disable **Secure Boot** as it is not supported by Unraid OS.
+✅ Set the USB flash drive as the primary boot device.\
+ ✅ Configure the storage controller to **%%AHCI|ahci%%** mode with SATA connections.\
+ ✅ Set the controller to **%%HBA mode|hba-mode%%** (not **%%RAID|raid%%**).\
+ ✅ Disable **Secure Boot** as it is not supported by Unraid OS.
 
-  ### Advanced Settings
+### Advanced Settings
 
-  ✅ Enable **%%hardware virtualization|hvm%%** features (e.g., **%%Intel VT-x|intel-vt-x%%** or **%%AMD-V|amd-v%%**) for **%%virtual machines (VMs)|vm%%**.\
-  ✅ Enable **%%IOMMU|iommu%%** support (Intel VT-d or AMD-Vi) for PCI device assignment to VMs.
+✅ Enable **%%hardware virtualization|hvm%%** features (e.g., **%%Intel VT-x|intel-vt-x%%** or **%%AMD-V|amd-v%%**) for **%%virtual machines (VMs)|vm%%**.\
+ ✅ Enable **%%IOMMU|iommu%%** support (Intel VT-d or AMD-Vi) for PCI device assignment to VMs.
 
-  ### Troubleshooting Tips
+### Troubleshooting Tips
 
-  If Unraid OS does not boot, try:
+If Unraid OS does not boot, try:
 
-  ✅ Adjusting the boot order to: **Forced-FDD**, **USB-HDD**, **USB-ZIP**.\
-  ✅ Disabling USB 2.0/3.0 support.\
-  ✅ Toggling any Fast Boot features.\
-  ✅ Toggling USB keyboard support.
+✅ Adjusting the boot order to: **Forced-FDD**, **USB-HDD**, **USB-ZIP**.\
+ ✅ Disabling USB 2.0/3.0 support.\
+ ✅ Toggling any Fast Boot features.\
+ ✅ Toggling USB keyboard support.
 
-  For further assistance, visit the [Unraid general support forum](https://forums.unraid.net/).
+For further assistance, visit the [Unraid general support forum](https://forums.unraid.net/).
 
-  :::important
-  Many motherboards limit boot device selection to 12 hard drives. If your USB flash drive is recognized as a hard drive, you may not be able to boot from it after installing 12 physical hard drives. Configure the BIOS to treat the flash drive as a removable device whenever possible.
+:::important
+Many motherboards limit boot device selection to 12 hard drives. If your USB flash drive is recognized as a hard drive, you may not be able to boot from it after installing 12 physical hard drives. Configure the BIOS to treat the flash drive as a removable device whenever possible.
 
-  If using an add-on HBA, you may be able to disable INT 13h support to prevent its connected drives from appearing in the bootable devices list, helping to stay within the 12-drive limit.
-  :::
+If using an add-on HBA, you may be able to disable INT 13h support to prevent its connected drives from appearing in the bootable devices list, helping to stay within the 12-drive limit.
+:::
 
 </details>