Updated homepage text for all 3 sections

This is ready to be pushed online.

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• 0157e99c - Add Bert's Gizmo vs. SPH Kelvin-Helmholtz comparison movie.

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Mmmh looks like the embedded video does not work. What did I do wrong?

It probably will when we push it up to the server. Often times these things don't work when you purely run a local copy (i.e. with a file:// extension at the start) for security reasons. I'll get these sorted in a little while.

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• 830d0cee - Minor typo fixes

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merged

mentioned in commit e3d33e15

All sorted: http://icc.dur.ac.uk/swift/about.html.

Thanks!