edit the comment on generated pages

Patch to `ucampas` to remove the reference to the `*-b.html` file, which otherwise forms part of the html comment at the top of generated pages.

This should avoid the large diffs when different people make updates to the site and mean that we can close #19

It appears to work fine on my machine but someone else should test it before it's merged --@pw374 or @avsm, I'm looking at you :)

If there are any updates to `ucampas`, this patch will probably have to be reapplied.