Improve overview image loading

Resources/Overview.svg

@@ -9,7 +9,10 @@
    id="svg1"
    xml:space="preserve"
    sodipodi:docname="Overview.svg"
-   inkscape:version="1.3.2 (091e20e, 2023-11-25)"
+   inkscape:version="1.3.2 (091e20ef0f, 2023-11-25)"
+   inkscape:export-filename="Overview.png"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns:xlink="http://www.w3.org/1999/xlink"
@@ -24,12 +27,12 @@
      inkscape:pagecheckerboard="0"
      inkscape:deskcolor="#d1d1d1"
      inkscape:zoom="0.21901077"
-     inkscape:cx="792.19847"
+     inkscape:cx="789.91549"
      inkscape:cy="1196.2882"
-     inkscape:window-width="1640"
-     inkscape:window-height="851"
-     inkscape:window-x="0"
-     inkscape:window-y="43"
+     inkscape:window-width="1507"
+     inkscape:window-height="906"
+     inkscape:window-x="35"
+     inkscape:window-y="32"
      inkscape:window-maximized="0"
      inkscape:current-layer="svg1" /><defs
      id="defs1" /><image

Tutorial/Table of Contents.tutorial

@@ -2,7 +2,7 @@
 
     @Intro(title: "Develop Apps for GNOME") {
         Learn the basics of _``Adwaita`` for Swift_ to create beautiful apps for the GNOME desktop.
-        @Image(source: "Overview.svg", alt: "An iMac with GNOME.")
+        @Image(source: "Overview.png", alt: "An iMac with GNOME.")
     }
 
     @Volume(name: "Foundation") {