MDL-56015 theme_boost: Clean up pix folder

Add real screenshot of new theme and delete unused images and icons.

theme/boost/pix/blocksdrawer.svg

@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Adobe Illustrator 20.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 40 40" style="enable-background:new 0 0 40 40;" xml:space="preserve">
-<style type="text/css">
-	.st0{fill:#373A3C;}
-</style>
-<path class="st0" d="M40,3.9v24.3c0,1-0.3,1.8-1,2.5s-1.5,1-2.5,1H3.6c-1,0-1.8-0.3-2.5-1s-1-1.5-1-2.5V3.9c0-1,0.3-1.8,1-2.5
-	s1.5-1,2.5-1h32.9c1,0,1.8,0.4,2.5,1C39.7,2.1,40,2.9,40,3.9z M37.1,28.2V9.6c0-0.2-0.1-0.4-0.2-0.5c-0.1-0.1-0.3-0.2-0.5-0.2H3.6
-	C3.4,8.9,3.2,9,3.1,9.1C2.9,9.3,2.9,9.4,2.9,9.6v18.6c0,0.2,0.1,0.4,0.2,0.5c0.1,0.1,0.3,0.2,0.5,0.2h32.9c0.2,0,0.4-0.1,0.5-0.2
-	S37.1,28.4,37.1,28.2z M8.6,12.5v1.4c0,0.2-0.1,0.4-0.2,0.5c-0.1,0.1-0.3,0.2-0.5,0.2H6.4c-0.2,0-0.4-0.1-0.5-0.2
-	c-0.1-0.1-0.2-0.3-0.2-0.5v-1.4c0-0.2,0.1-0.4,0.2-0.5s0.3-0.2,0.5-0.2h1.4c0.2,0,0.4,0.1,0.5,0.2C8.5,12.1,8.6,12.3,8.6,12.5z
-	 M8.6,18.2v1.4c0,0.2-0.1,0.4-0.2,0.5c-0.1,0.1-0.3,0.2-0.5,0.2H6.4c-0.2,0-0.4-0.1-0.5-0.2s-0.2-0.3-0.2-0.5v-1.4
-	c0-0.2,0.1-0.4,0.2-0.5s0.3-0.2,0.5-0.2h1.4c0.2,0,0.4,0.1,0.5,0.2C8.5,17.9,8.6,18,8.6,18.2z M8.6,23.9v1.4c0,0.2-0.1,0.4-0.2,0.5
-	C8.3,25.9,8.1,26,7.9,26H6.4c-0.2,0-0.4-0.1-0.5-0.2s-0.2-0.3-0.2-0.5v-1.4c0-0.2,0.1-0.4,0.2-0.5s0.3-0.2,0.5-0.2h1.4
-	c0.2,0,0.4,0.1,0.5,0.2C8.5,23.6,8.6,23.7,8.6,23.9z M34.3,12.5v1.4c0,0.2-0.1,0.4-0.2,0.5c-0.1,0.1-0.3,0.2-0.5,0.2H12.1
-	c-0.2,0-0.4-0.1-0.5-0.2c-0.1-0.1-0.2-0.3-0.2-0.5v-1.4c0-0.2,0.1-0.4,0.2-0.5c0.1-0.1,0.3-0.2,0.5-0.2h21.4c0.2,0,0.4,0.1,0.5,0.2
-	C34.2,12.1,34.3,12.3,34.3,12.5z M34.3,18.2v1.4c0,0.2-0.1,0.4-0.2,0.5c-0.1,0.1-0.3,0.2-0.5,0.2H12.1c-0.2,0-0.4-0.1-0.5-0.2
-	s-0.2-0.3-0.2-0.5v-1.4c0-0.2,0.1-0.4,0.2-0.5c0.1-0.1,0.3-0.2,0.5-0.2h21.4c0.2,0,0.4,0.1,0.5,0.2C34.2,17.9,34.3,18,34.3,18.2z
-	 M34.3,23.9v1.4c0,0.2-0.1,0.4-0.2,0.5C34,25.9,33.8,26,33.6,26H12.1c-0.2,0-0.4-0.1-0.5-0.2s-0.2-0.3-0.2-0.5v-1.4
-	c0-0.2,0.1-0.4,0.2-0.5c0.1-0.1,0.3-0.2,0.5-0.2h21.4c0.2,0,0.4,0.1,0.5,0.2C34.2,23.6,34.3,23.7,34.3,23.9z"/>
-</svg>

theme/boost/scss/moodle.scss

@@ -1,7 +1,4 @@
 // Set image location.
-$iconSpritePath:          "[[pix:theme|glyphicons-halflings]]" !default;
-$iconWhiteSpritePath:     "[[pix:theme|glyphicons-halflings-white]]" !default;
-
 $breadcrumb-divider: "▶" !default;
 $breadcrumb-divider-rtl: "◀" !default;