index.html: Replace 'Star Trek' with 'fancy'

index.html: Replace 'Star Trek' with 'fancy'

Star Trek is trademarked [1].  I don't think referencing it as an
synonym for fancy/futuristic infringes on the trademark (although this
slide show may be projected on a screen in front of an audience ;),
but it's better to avoid the term anyway.

[1]: http://www.startrek.com/