Move tabs to tab folder

src/Tools/tim_tool/ui/tab/about-tab.slint

@@ -0,0 +1,10 @@
+import { AboutSlint } from "std-widgets.slint";
+export component AboutTab {
+    VerticalLayout {
+        AboutSlint {}
+        Text {
+            x: 8pt;
+            text: "TIM_Tool Version 0.1.0";
+        }
+    }
+}