feat(windows): add ViGEmBus driver management API and UI integration (#4625)

Introduces backend API endpoints for ViGEmBus status and installation, updates Windows build scripts to handle ViGEmBus versioning and installer download, and integrates ViGEmBus status and installation controls into the web UI. Removes legacy PowerShell scripts for gamepad driver management and related NSIS installer commands.

docs/getting_started.md

@@ -369,21 +369,7 @@ overflow menu. Different versions of Windows may provide slightly different step
    scripts/delete-firewall-rule.bat
    ```
 
-4. Virtual Gamepad Support
-
-   Install:
-   ```bash
-   cd /d {path to extracted directory}
-   scripts/install-gamepad.bat
-   ```
-
-   Uninstall:
-   ```bash
-   cd /d {path to extracted directory}
-   scripts/uninstall-gamepad.bat
-   ```
-
-5. Windows service
+4. Windows service
 
    Install:
    ```bash
@@ -465,6 +451,11 @@ Sunshine can only access microphones on macOS due to system limitations. To stre
 > [!CAUTION]
 > Gamepads are not currently supported.
 
+### Windows
+In order for virtual gamepads to work, you must install ViGEmBus. You can do this from the troubleshooting tab
+in the web UI, as long as you are running Sunshine as a service or as an administrator. After installation, it is
+recommended to restart your computer.
+
 ## Usage
 
 ### Basic usage