Include orca in the Silverblue
    
    The default Silverblue installation should be accessible by default,
    lets include the Orca there. It brings in the following dependencies (on
    F30):
    
      brlapi-0.6.7-32.fc30.x86_64
      brltty-5.6-32.fc30.x86_64
      dotconf-1.3-20.fc30.x86_64
      espeak-ng-1.49.2-6.fc30.x86_64
      libXres-1.2.0-6.fc30.x86_64
      libao-1.2.0-14.fc30.x86_64
      liblouis-3.10.0-1.fc30.x86_64
      libwnck3-3.32.0-1.fc30.x86_64
      orca-3.32.0-1.fc30.noarch
      pcaudiolib-1.1-3.fc30.x86_64
      python3-brlapi-0.6.7-32.fc30.x86_64
      python3-louis-3.10.0-1.fc30.noarch
      python3-pyatspi-2.32.1-1.fc30.noarch
      python3-speechd-0.9.1-1.fc30.x86_64
      speech-dispatcher-0.9.1-1.fc30.x86_64
      speech-dispatcher-espeak-ng-0.9.1-1.fc30.x86_64
    
    It's about 10.6 MB download size and ~57 MB installed size (size of of
    two deployments).