Partials: Use correct hierarchy for partials
The old method of using partial imports in the `pages/_partials/`
directory was deprecated in Antora. This commit moves the existing
attributes to the new file path.
I also updated a few of the attributes, like `MAJOROSVER` from 32 to 33.
Signed-off-by: Justin W. Flory (he/him) <git@jwf.io>