adjust about dialog, adapt icon to gnome guidelines

data/icons/hicolor/scalable/apps/de.zwarf.picplanner.svg

@@ -2,14 +2,38 @@
 <!-- Created with Inkscape (http://www.inkscape.org/) -->
 
 <svg
-   width="120mm"
-   height="120mm"
-   viewBox="0 0 120 120"
+   width="120"
+   height="120"
+   viewBox="0 0 31.75 31.75"
    version="1.1"
    id="svg5"
+   sodipodi:docname="de.zwarf.picplanner.svg"
+   inkscape:version="1.1.1 (3bf5ae0d25, 2021-09-20)"
+   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"
    xmlns="http://www.w3.org/2000/svg"
    xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview22"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:document-units="mm"
+     showgrid="false"
+     units="px"
+     inkscape:zoom="1.5852951"
+     inkscape:cx="207.53233"
+     inkscape:cy="226.45625"
+     inkscape:window-width="1920"
+     inkscape:window-height="1011"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg5" />
   <defs
      id="defs2">
     <linearGradient
@@ -36,7 +60,7 @@
   </defs>
   <g
      id="layer1"
-     transform="translate(-69.954025,-229.38797)">
+     transform="matrix(0.22048611,0,0,0.22048611,-12.778056,-47.931026)">
     <circle
        style="fill:#464646;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:3.49514;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        id="path5856"

data/icons/meson.build

@@ -11,5 +11,3 @@ install_data(
   join_paths(symbolic_dir, ('@0@-symbolic.svg').format(application_id)),
   install_dir: join_paths(get_option('datadir'), 'icons', symbolic_dir)
 )
-
-

src/picplanner-application.c

@@ -107,7 +107,9 @@ picplanner_application_show_about (GSimpleAction *action,
                          "program-name", "PicPlanner",
                          "authors", authors,
                          "logo-icon-name", "de.zwarf.picplanner",
-                         "version", "0.0.1",
+                         "version", "0.1.0",
+                         "comments", _("Plan your photographs"),
+                         "website", "https://gitlab.com/Zwarf/picplanner",
                          NULL);
 }