Delete an unused file

src/images/picture.svg

-<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<svg xmlns="http://www.w3.org/2000/svg" height="600" version="1.1" width="600"
-     viewBox="0 0 600 600">
-
-<defs>
-  <linearGradient id="background" x2="0%" y2="100%" spreadMethod="reflect">
-    <stop offset="0%" stop-color="#202040" opacity="0" />
-    <stop offset="100%" stop-color="#202020" />
-  </linearGradient>
-  <radialGradient id="sphere" fx="75%" fy="25%">
-    <stop offset="0%" stop-color="white" />
-    <stop offset="25%" stop-color="#a0ffa0" />
-    <stop offset="100%" stop-color="#002000" />
-  </radialGradient>
-</defs>
-
-  <rect x="0" y="0" width="600" height="600" stroke="none" fill="url(#background)" />
-  <circle cx="300" cy="300" r="200" stroke="none" fill="url(#sphere)" />
-</svg>