Add artist-icon.svg and give all sidebar icons a slight gradient

data/images/share.svg

@@ -1,53 +1,9 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Created with Inkscape (http://www.inkscape.org/) -->
-
-<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"
-   id="svg2"
-   version="1.1"
-   inkscape:version="0.48.2 r9819"
-   width="76.25"
-   height="76.25"
-   xml:space="preserve"
-   sodipodi:docname="share.pdf"><metadata
-     id="metadata8"><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="defs6" /><sodipodi:namedview
-     pagecolor="#ffffff"
-     bordercolor="#666666"
-     borderopacity="1"
-     objecttolerance="10"
-     gridtolerance="10"
-     guidetolerance="10"
-     inkscape:pageopacity="0"
-     inkscape:pageshadow="2"
-     inkscape:window-width="640"
-     inkscape:window-height="480"
-     id="namedview4"
-     showgrid="false"
-     inkscape:zoom="3.7721311"
-     inkscape:cx="38.125"
-     inkscape:cy="38.125"
-     inkscape:window-x="0"
-     inkscape:window-y="0"
-     inkscape:window-maximized="0"
-     inkscape:current-layer="g10" /><g
-     id="g10"
-     inkscape:groupmode="layer"
-     inkscape:label="share"
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+<svg width="64px" height="59px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sketch="http://www.bohemiancoding.com/sketch/ns">
+    <title>share</title>
+    <description>Created with Sketch (http://www.bohemiancoding.com/sketch)</description>
+    <defs></defs>
+    <g id="Page 1" fill="rgb(215,215,215)" fill-rule="evenodd">
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+    </g>
+</svg>