Initiatives: Convert "Objectives" to "Community Initiatives"
    
    This commit follows in-person discussion by the Fedora Council in our
    2023 Council hackfest in Frankfurt, Germany. We agreed to convert
    "Objectives" into "Community Initiatives", which we agreed was easier to
    understand and communicate the roles of these efforts in the project.
    
    There is no functional change to Objectives. It is just a cosmetic
    change, and we will follow this change with more communications about
    the transition to bring more excitement into Initiatives.
    
    Signed-off-by: Justin W. Flory (he/him) <jwf@redhat.com>