Update main menu.

Looks like we lost the ability to select a test to run.  Maybe this
can be added back in the future?  It would require the not-run tests
to list themselves on the page, which they no longer do.

index.html

@@ -25,7 +25,8 @@
         Tests
         <ul>
             <li><a href="Specs/SpecRunner.html">Run all tests</a></li>
-            <li><a href="Specs/SpecRunner.html?suite=_none_">Select a test to run</a></li>
+            <li><a href="Specs/SpecRunner.html?category=WebGL">Run only WebGL tests</a></li>
+            <li><a href="Specs/SpecRunner.html?category=All&not=WebGL">Run only non-WebGL tests</a></li>
             <li><a href="Instrumented/jscoverage.html?../Specs/SpecRunner.html%3FbaseUrl%3D..%2FInstrumented">Run all tests with code coverage</a>
                 (build 'instrumentForCoverage' first.)</li>
         </ul>