Broke up UI into seperate file, reorganisation of dirtree, added ViewStack

data/resources/ui/settings.ui

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+DO NOT EDIT!
+This file was @generated by blueprint-compiler. Instead, edit the
+corresponding .blp file and regenerate this file with blueprint-compiler.
+-->
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <template class="SettingsPage" parent="GtkBox">
+    <child>
+      <object class="AdwClamp">
+        <child>
+          <object class="GtkBox">
+            <child>
+              <object class="GtkText">
+                <property name="text" translatable="yes">This is a placeholder!</property>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </template>
+</interface>