update logo to just use paths in svg

doc/mimalloc-logo.svg

@@ -36,15 +36,15 @@
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      inkscape:pageshadow="2"
      inkscape:zoom="23.706667"
-     inkscape:cx="34.419045"
+     inkscape:cx="24.864771"
      inkscape:cy="35.79485"
      inkscape:document-units="mm"
      inkscape:current-layer="layer1"
      showgrid="false"
      inkscape:window-width="3840"
-     inkscape:window-height="2160"
-     inkscape:window-x="0"
-     inkscape:window-y="0"
+     inkscape:window-height="2050"
+     inkscape:window-x="-12"
+     inkscape:window-y="-12"
      inkscape:window-maximized="1"
      inkscape:snap-object-midpoints="false"
      inkscape:snap-bbox="false"
@@ -126,17 +126,15 @@
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          id="path6525" />
     </g>
-    <text
-       xml:space="preserve"
+    <g
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-       x="1.6752419"
-       y="293.17081"
-       id="text848"><tspan
-         y="293.17081"
-         x="1.6752419"
-         sodipodi:role="line"
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+       id="text848">
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