doc, misc: add script for filtering candidates for Fedora Magazine article
    
    We are too lazy to go through the hundreds of new projects every month
    and filter them manually. This script will pick only those projects
    that have at least some information filled in, have at least one
    successfully built pacakge in them, and provide something that is not
    already available though official Fedora repositories.
    
    This narrows the selection from hundreds of projects to only tens of
    projects, which is then manageable to go through manually.