Previously had partial docs for Fedora 31. This updates to Fedora 33, adds
support for audio and video and adds dependencies to allow the test suite to run
to completion.
The `audiotospectrogram` module is a complete rewrite of the existing spectrogram
code with support for Python 3. This allows us to drop the bundled `freesound`
library and Python 2-only `audioprocessing` and `spectrogram` modules.
Signed-off-by: Ben Sturmfels <ben@sturm.com.au>
Mostly a thorough test and cleanup. The significant change is moving the systemd
config into the deployment docs an the registration/security considerations to
production considerations docs.
