cleanup and more subtle color

resources/frontend_client/app/components/icons/assets/header_rect.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg width="58px" height="57px" viewBox="0 0 58 57" 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">
-    <!-- Generator: Sketch 3.3.3 (12072) - http://www.bohemiancoding.com/sketch -->
-    <title>Rectangle 329 Copy 30</title>
-    <desc>Created with Sketch.</desc>
-    <defs></defs>
-    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" sketch:type="MSPage">
-        <g id="home-page---activity" sketch:type="MSArtboardGroup" transform="translate(-393.000000, -53.000000)" fill="#509ADD">
-            <g id="Group" sketch:type="MSLayerGroup" transform="translate(-6.000000, -9.000000)">
-                <g transform="translate(13.000000, -3.000000)" id="Rectangle-329-Copy-30" sketch:type="MSShapeGroup">
+<svg width="58px" height="57px" viewBox="0 0 58 57" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <g stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g transform="translate(-393.000000, -53.000000)" fill="#4F9CE0">
+            <g transform="translate(-6.000000, -9.000000)">
+                <g transform="translate(13.000000, -3.000000)">
                     <rect transform="translate(415.000000, 93.715729) rotate(-45.000000) translate(-415.000000, -93.715729) " x="395" y="73.7157288" width="40" height="40"></rect>
                 </g>
             </g>
         </g>
     </g>
-</svg>
\ No newline at end of file
+</svg>