Cleanup images, replace some icons

.github/readme-images/sy_logo.svg

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 21.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="svg8" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 172 172" style="enable-background:new 0 0 172 172;" xml:space="preserve">
+<style type="text/css">
+	.st0{stroke:#CE2828;stroke-width:14;stroke-linecap:round;stroke-linejoin:round;}
+	.st1{fill:#F7D009;}
+	.st2{fill:#E40F85;}
+</style>
+<title>sy_hobo_stds_mine</title>
+<g id="layer1">
+	<path id="path4535" class="st0" d="M85.3,7C129,6.6,164.6,41.7,165,85.3c0.4,43.6-34.7,79.3-78.3,79.7C43.1,165.4,7.4,130.3,7,86.7
+		c0-0.5,0-0.9,0-1.4C7.4,42.2,42.2,7.4,85.3,7z"/>
+	<g id="text4543">
+		<path id="path4545" class="st1" d="M76,64.2c2.9,0,8.4-9.4,8.4-12.5S73.5,40.7,58.2,40.7c-21.4,0-27.4,15-27.4,23.8
+			c0,9.1,2.5,19.6,25.6,26.6c6.1,2,15.6,5.1,15.6,12.8c0,6.5-6.9,9.9-15,9.9c-22.6,0-20.9-21.3-22.6-21.3c-1.1,0-6.4,5.1-6.4,14.2
+			c0,16.7,15.2,24.7,30.1,24.7c22.3,0,31-15,31-27.2c0-9.9-4.5-20.7-26.7-28.1c-5.8-2-16.2-4.8-16.2-12.5c0-6.2,6.8-8.8,12-8.8
+			C69.2,54.8,73.3,64.2,76,64.2L76,64.2z"/>
+		<path id="path4547" class="st2" d="M95.4,128.7c0,1.4,1.1,2.6,2.6,2.6c23.2,0,47-29.8,46-60.7c0-4.5,0.3-7.9-1.7-8.2h-9.4
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+	</g>
+</g>
+</svg>