[kde-doc-english] Kate vi-mode doc formatting

[T.C. Hollingsworth]

I've taken a first stab at reformatting Kate's vi mode documentation
appropriately.  My DocBook isn't that strong so please let me know if
I did anything wrong.

Next I'll work on filling some of the placeholder text for the
commands with real info.  I was hoping I could borrow some of vim's
documentation but unfortunately it's under the OPL, which is
FDL-incompatible according to the FSF.  :-(
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