Create historical snapshot of KK26 site.

Move KK26 site root into kk/kk26.
Create historical snapshot of KK25 site.

Move KK25 site root into kk/kk25.
Remove duplicate KK25 files.
Create historical snapshot of KK24 site.

Move KK24 site root into kk/kk24.
Remove duplicate KK24 files.
Clean out KK26/old.

All it contained were duplicates of KK25 files.
Clean up the root OLD directory.

It mainly contains duplicates of KK26 files.
Remove H5BP index.html file.

I think I had placed it in the root OLD directory when I was making the KK27 site to keep it safe and out of the way.
Now that it's value has been ported into the PARTIAL php scripts, it isn't necessary to keep it around anymore.
Note that this may impact future pulls from the H5BP upstream (as those changes will likely be to this index.html file.
Clean out KK25 files from root OLD directory.

Now it mostly contains duplicates of KK25 files.
Solved mystery of individualreg.txt.

Turns out it was the Individual registration HTML page for KK25 that someone had just changed the extension on.