add5875 Partials: Add reusable attributes for dynamic docs

Authored and Committed by jflory7 3 years ago
    Partials: Add reusable attributes for dynamic docs
    
    This commit creates reusable attributes with Antora partials, as
    documented in the Fedora Docs docs:
    
    https://docs.fedoraproject.org/en-US/fedora-docs/asciidoc-fedora/reusable-attributes/
    
    Signed-off-by: Justin W. Flory (he/him) <git@jwf.io>