Update the logo to use the official one with transparent background

logo.svg

@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="66mm"
+   height="66mm"
+   viewBox="0 0 233.85826 233.85827"
+   version="1.1"
+   id="svg6"
+   sodipodi:docname="logo.svg"
+   inkscape:version="0.92.4 5da689c313, 2019-01-14"
+   inkscape:export-filename="/home/nebulon/projects/yellowtent/apps/mastodon-app/logo.png"
+   inkscape:export-xdpi="197.03999"
+   inkscape:export-ydpi="197.03999">
+  <metadata
+     id="metadata12">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs10" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="2880"
+     inkscape:window-height="1564"
+     id="namedview8"
+     showgrid="false"
+     inkscape:zoom="0.95362368"
+     inkscape:cx="115.42102"
+     inkscape:cy="121.64127"
+     inkscape:window-x="0"
+     inkscape:window-y="56"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg6" />
+  <g
+     id="g4524"
+     transform="translate(8.721935,-0.92425997)">
+    <path
+       style="fill:#2b90d9"
+       inkscape:connector-curvature="0"
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+    <path
+       style="fill:#ffffff"
+       inkscape:connector-curvature="0"
+       id="path4"
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+  </g>
+</svg>