Allow for bypassing of tidy process

Sometimes a tidy HTML file isn't right for a file: for example a poem
where we don't want to use <pre> tags. So we rely on "white-space:
pre" to allow it to be retained; but tidy would remove that.

So during build we can extract the "notidy" tag and if its unset we
will run the same tidy as usual else we bypass it outright

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