Move images into their own folder

Author: carlosperate

apple.png renamed to img/apple.png

@@ -35,7 +35,7 @@ <h4>Have fun</h4>
 <div class="row">
   <div class="col-sm-6 col-md-4">
     <div class="thumbnail">
-      <img src="windows.png" alt="Windows">
+      <img src="img/windows.png" alt="Windows">
       <div class="caption">
         <h3>Mu for Windows</h3>
         <p>Download the .exe file and double-click to launch. For the
@@ -46,7 +46,7 @@ <h3>Mu for Windows</h3>
   </div>
   <div class="col-sm-6 col-md-4">
     <div class="thumbnail">
-      <img src="apple.png" alt="Apple">
+      <img src="img/apple.png" alt="Apple">
       <div class="caption">
         <h3>Mu for OSX</h3>
         <p>Download the file. Right (control) click on it and select open
@@ -57,7 +57,7 @@ <h3>Mu for OSX</h3>
   </div>
   <div class="col-sm-6 col-md-4">
     <div class="thumbnail">
-      <img src="linux.png" alt="Linux">
+      <img src="img/linux.png" alt="Linux">
       <div class="caption">
         <h3>Mu for Linux</h3>
         <p>Make the file executable