ab: improve image in readme

.readme_images/slider-cranck_mechanism.svg

@@ -48,7 +48,7 @@
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      inkscape:window-maximized="1"
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+     inkscape:current-layer="layer1"
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@@ -8717,6 +8717,16 @@
        d="M 158.53093,80.218313 140.17744,107.73133"
        id="path4961"
        sodipodi:nodetypes="cc" />
+    <rect
+       style="display:inline;opacity:1;fill:#ffffff;stroke:none;stroke-width:0.01;stroke-linejoin:round"
+       id="rect2785"
+       width="321.79547"
+       height="97.709999"
+       x="228.19055"
+       y="-57.463825"
+       transform="translate(-213.19732,-3.7878719)"
+       inkscape:export-xdpi="150"
+       inkscape:export-ydpi="150" />
   </g>
   <g
      inkscape:label="kinem_scheme_landmarks"
@@ -9335,7 +9345,9 @@
       <g
          style="display:inline;opacity:1"
          transform="translate(-400.68374,-509.13791)"
-         id="g8614">
+         id="g8614"
+         inkscape:export-xdpi="150"
+         inkscape:export-ydpi="150">
         <path
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            inkscape:connector-curvature="0"