fix topbar to work on mobile devices

The topbar, by way of JavaScript, now works
on mobile devices such as cell phones and
tablets.

Internal links for entries from 1984 thru 2015
have been adjusted.

Ran `make www` to perform the above.

TODO: Fix some color issues on topbar.

TODO: More testing!

2013/hou/doc/example.md

@@ -247,7 +247,7 @@ the camera, and shoot a ray from the camera point to the image plane point, see:
 .. and the ray direction vector (image plane point - camera point) is `(X,Y,Z)`. For the
 coordinate space, volume 0 is scaled up 64x here to `(0,0,0)-(4096,4096,4096)`.
 
-For a basic camera shader example, check [otherroom.scene](../otherroom.scene).
+For a basic camera shader example, check [otherroom.scene](%%REPO_URL%%/2013/hou/otherroom.scene).
 
 If any ray goes out of volume 0, the renderer crashes. Make sure it doesn't
 happen. Wall up everything.