Switch relevant links to use macros
    
    This commit is a follow-up to PR #117. That PR added a new
    `_partials/attributes.adoc` file with reusable macros. This commit
    actually implements the macros across our docs. This updates a lot of
    links to use the macros for the Fedora Wiki. I also changed some links
    from Fedora Wiki URLs to `xref` macros, since some page we linked out to
    are now hosted in our docs site.
    
    Signed-off-by: Justin W. Flory <git@jwf.io>