🍱 Update GitHub image (#701)

img/github-social-preview.svg

@@ -7,6 +7,9 @@
    width="338.66666mm"
    sodipodi:docname="github-social-preview.svg"
    inkscape:version="1.3.2 (091e20e, 2023-11-25)"
+   inkscape:export-filename="github-social-preview.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="http://www.w3.org/2000/svg"
@@ -32,7 +35,8 @@
      inkscape:window-x="0"
      inkscape:window-y="0"
      inkscape:window-maximized="1"
-     inkscape:current-layer="svg8" />
+     inkscape:current-layer="svg8"
+     inkscape:export-bgcolor="#ffffffff" />
   <defs
      id="defs2" />
   <metadata
@@ -46,13 +50,6 @@
       </cc:Work>
     </rdf:RDF>
   </metadata>
-  <rect
-     style="opacity:0.98000004;fill:#ffffff;fill-opacity:1;stroke-width:0.26458332"
-     id="rect853"
-     width="338.66666"
-     height="169.33333"
-     x="-1.0833333e-05"
-     y="0.71613133" />
   <g
      id="g1">
     <g