put shell in subdir, and add nix package

shell/widgets/ColoredIcon.qml

@@ -0,0 +1,32 @@
+pragma ComponentBehavior: Bound
+
+import QtQuick
+import QtQuick.Effects
+import Quickshell.Widgets
+import ".."
+
+Item {
+    id: root
+    required property var source
+    property var implicitSize: 0
+    property var color: "white"
+    readonly property real actualSize: Math.min(root.width, root.height)
+
+    implicitWidth: implicitSize
+    implicitHeight: implicitSize
+
+    IconImage {
+        anchors.fill: parent
+        source: root.source
+        layer.enabled: true
+        layer.effect: MultiEffect {
+            colorization: 1
+            colorizationColor: root.color
+        }
+    }
+
+    Rectangle {
+        color: root.color
+        anchors.fill: parent
+    }
+}