Merge pull request #4 from edx/dstgermain/a11y-demo

alt attribute is unnecessary here

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 <h2>Labs and Demos</h2>
-<p><img src="/static/labs_x250.png" alt="Labs" width="250" hspace="12" vspace="12" border="0" align="right" />Professors that create courses on edX are able to implement highly interactive experiences that allow you as a student to experiment using easy to use online web applications. These labs are customized to each class and subject area. We have collected a couple of the more popular lab environments here for you to experience and play with.</p>
+<p><img src="/static/labs_x250.png" alt="" width="250" hspace="12" vspace="12" border="0" align="right" />Professors that create courses on edX are able to implement highly interactive experiences that allow you as a student to experiment using easy to use online web applications. These labs are customized to each class and subject area. We have collected a couple of the more popular lab environments here for you to experience and play with.</p>
 <p>Please be patient with yourself as you take a look around at these lab environments. You probably will not be able to answer these questions without taking a course on the topic first!</p>
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