fix: Add missing image to repository

img/chain-plus-dark.svg

@@ -0,0 +1,75 @@
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+
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+   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"
+   version="1.1"
+   id="Ebene_2"
+   x="0px"
+   y="0px"
+   width="16"
+   height="16"
+   viewBox="0 0 16 16"
+   enable-background="new 0 0 32 32"
+   xml:space="preserve"
+   sodipodi:docname="chain-plus.svg"
+   inkscape:version="0.92.5 (2060ec1f9f, 2020-04-08)"><metadata
+   id="metadata16"><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="defs14">
+	
+	
+	
+	
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+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="1327"
+   inkscape:window-height="986"
+   id="namedview12"
+   showgrid="false"
+   inkscape:zoom="7.375"
+   inkscape:cx="-10.440678"
+   inkscape:cy="22.536696"
+   inkscape:window-x="2079"
+   inkscape:window-y="754"
+   inkscape:window-maximized="0"
+   inkscape:current-layer="Ebene_2" />
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+   inkscape:connector-curvature="0"
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+   inkscape:connector-curvature="0"
+   id="path8"
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+   style="stroke-width:0.55518758" />
+<text
+   xml:space="preserve"
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+   y="17.006468"
+   id="text4560"><tspan
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+     id="tspan4558"
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+</svg>