core/qmlglobal: re-add shellRoot as a deprecated property

Author: outfoxxed

src/core/qmlglobal.hpp

@@ -109,6 +109,8 @@ class QuickshellGlobal: public QObject {
 	/// The root directory is the folder containing the entrypoint to your shell, often referred
 	/// to as `shell.qml`.
 	Q_PROPERTY(QString configDir READ configDir CONSTANT);
+	/// > [!WARNING] Deprecated: Returns @@configDir.
+	Q_PROPERTY(QString shellRoot READ configDir CONSTANT);
 	/// Quickshell's working directory. Defaults to whereever quickshell was launched from.
 	Q_PROPERTY(QString workingDirectory READ workingDirectory WRITE setWorkingDirectory NOTIFY workingDirectoryChanged);
 	/// If true then the configuration will be reloaded whenever any files change.