Add matrix well-known files
    
    Matrix can use some well-known uri's for configuration (rfc 8615).
    This commit:
    * Sets up fedora.im as a seperate side on proxies that redirects to
      getfedora.org and serves a server and client static matrix file.
    * gets fedora.im it's own ssl cert via letsencrypt so it's all valid
      (currently it points to proxies generically and gets the
    fedoraproject.org cert)
    * Adds config to serve matrix client/server well-known static files for
      fedoraproject.org site.
    
    Note that all the acutal contents of these files are empty for now, but
    once our matrix server is up we can fill them in properly and re-run the
    playbook. :)
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>