Add minimum RAM and disk requirements to website

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

index.html

@@ -646,7 +646,12 @@ USE_OSGPLUGIN(<plugin2>)
     <p>
     MXE requires a recent Unix system where
     all components as stated in the table below
-    are installed.
+    are installed. It also needs roughly 4 GB of
+    RAM to link gcc and at least 700 MB of disk
+    space per target (counted with only gcc
+    built).
+    </p>
+    <p>
     Detailed instructions are available for:
     </p>