add a link to pkg.mxe.cc to index.html

See https://github.com/mxe/mxe/issues/911#issuecomment-146791434

index.html

@@ -211,7 +211,7 @@ exit</pre>
     </p>
     <pre>cd /opt/mxe</pre>
 
-    <h3 id="tutorial-3">Step 3: Build MXE</h3>
+    <h3 id="tutorial-3">Step 3a: Build MXE</h3>
 
     <p>
     Enter the directory where you've downloaded MXE.
@@ -269,6 +269,15 @@ exit</pre>
     After you're done it just needs a little post-installation.
     </p>
 
+    <h3 id="tutorial-3b">Step 3b: Install MXE from the binary distribution</h3>
+
+    <p>
+    Instead of building MXE packages from source, you can
+    download precompiled packages. There are two options:
+    tar archives and Debian packages.
+    See <a href="http://pkg.mxe.cc/">pkg.mxe.cc</a>.
+    </p>
+
     <h3 id="tutorial-4">Step 4: Environment Variables</h3>
 
     <p>
@@ -647,6 +656,11 @@ USE_OSGPLUGIN(&lt;plugin2&gt;)
     Only the <a href="https://www.debian.org/releases/stable/">latest Debian stable series</a> is supported.
     </p>
 
+    <p>
+    You can install a precompiled MXE via Debian packages.
+    See <a href="http://pkg.mxe.cc/">pkg.mxe.cc</a>.
+    </p>
+
     <h3 id="requirements-fedora">Fedora</h3>
 
     <!-- https://admin.fedoraproject.org/pkgdb/ -->
@@ -4082,6 +4096,9 @@ endef</pre>
     <li>
         <a href="https://github.com/mxe/mxe">Project on GitHub</a>
     </li>
+    <li>
+        <a href="http://pkg.mxe.cc/">Binary distribution of packages</a>
+    </li>
     <li>
         <a href="https://www.openhub.net/p/mxe">Entry on Open Hub</a>
     </li>