Use SVG logos on the download page

layouts/css/page-modules/_download.styl

@@ -38,9 +38,10 @@
         padding-top 1em
         background $light-green
 
-    img
+    .download-logo
         display block
         margin 0 auto
+        fill: $node-green
 
     p
         padding-bottom 1em

layouts/partials/download-matrix.hbs

@@ -17,21 +17,21 @@
             </li>
             <li>
                 <a href="https://nodejs.org/dist/{{version}}/node-{{version}}-x86.msi" id="windows-downloadbutton" data-version="{{version}}">
-                    <img src="/static/images/platform-icon-win.png" height="50" width="45" alt="">
+                    <svg class="download-logo" width="50" height="50" viewBox="0 0 50 50"><path d="M1.589 23.55l-0.017-15.31 18.839-2.558v17.868zM23.55 5.225l25.112-3.654v21.979h-25.112zM48.669 26.69l-0.006 21.979-25.112-3.533v-18.446zM20.41 44.736l-18.824-2.58-0.001-15.466h18.825z"></path></svg>
                     Windows Installer
                     <p class="small color-lightgray">node-{{version}}-x86.msi</p>
                 </a>
             </li>
             <li>
                 <a href="https://nodejs.org/dist/{{version}}/node-{{version}}.pkg">
-                    <img src="/static/images/platform-icon-osx.png" height="50" width="45" alt="">
+                    <svg class="download-logo" width="50" height="50" viewBox="0 0 50 50"><path d="M39.054 34.065q-1.093 3.504-3.448 7.009-3.617 5.495-7.205 5.495-1.374 0-3.925-0.897-2.411-0.897-4.233-0.897-1.71 0-3.981 0.925-2.271 0.953-3.701 0.953-4.261 0-8.439-7.261-4.121-7.317-4.121-14.102 0-6.392 3.168-10.485 3.14-4.037 7.962-4.037 2.019 0 4.962 0.841 2.916 0.841 3.869 0.841 1.262 0 4.009-0.953 2.86-0.953 4.85-0.953 3.336 0 5.972 1.822 1.458 1.009 2.916 2.804-2.215 1.878-3.196 3.308-1.822 2.635-1.822 5.803 0 3.476 1.934 6.252t4.43 3.533zM28.512 1.179q0 1.71-0.813 3.813-0.841 2.103-2.607 3.869-1.514 1.514-3.028 2.019-1.037 0.308-2.916 0.477 0.084-4.177 2.187-7.205 2.075-3 7.009-4.149 0.028 0.084 0.070 0.308t0.070 0.308q0 0.112 0.014 0.28t0.014 0.28z"></path></svg>
                     Macintosh Installer
                     <p class="small color-lightgray">node-{{version}}.pkg</p>
                 </a>
             </li>
             <li>
                 <a href="https://nodejs.org/dist/{{version}}/node-{{version}}.tar.gz">
-                    <img src="/static/images/platform-icon-generic.png" height="50" width="45" alt="">
+                    <svg class="download-logo" width="50" height="50" viewBox="0 0 50 50"><path d="M25.030 0.934l-24.871 10.716 24.895 10.632 25.152-10.656-25.176-10.691zM26.050 23.62v25.686l24.188-11.483v-24.478l-24.188 10.275zM0.001 37.824l24.27 11.483v-25.686l-24.27-10.275v24.478z"></path></svg>
                     Source Code
                     <p class="small color-lightgray">node-{{version}}.tar.gz</p>
                 </a>