docs: Fix installation of internals/*.html
We were just installing them in the top level html directory, which broke navigation and overwrote other pages. https://bugzilla.redhat.com/show_bug.cgi?id=837825
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We were just installing them in the top level html directory, which broke navigation and overwrote other pages. https://bugzilla.redhat.com/show_bug.cgi?id=837825