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The `photoframe` script was based on the one used by the original
Buildroot-based photo frame system. I've split it into two processes,
though: one to listen to the URL stream and download new photos as
instructed by the server, and another to actually display the photos.
Getting `feh` and Firefox to both be fullscreen at the same time was
difficult, and only works if they are on separate Sway workspaces. Thus,
"activating" the slide show means switching to the workspace where `feh`
is and "deactivating" it means switching back to Firefox's workspace.
This commit introduces the _kiosk.service_ unit, which launches `sway`
to start a Wayland session, which in turn launches Firefox. The
`policies.json` file configures Firefox in a sort of kiosk mode,
disabling most features and blocking all but the desginated sites.
Unfortunately, running `firefox --kiosk` doesn't actually work: Firefox
apparently runs, but doesn't draw anything on the screen.
Note that we have to launch Firefox by its "real" path, since
`/usr/bin/firefox` is a Bash script, and Bash is not installed.
Fortunately, the wrapper script doesn't do anything we really care
about, so bypassing it is fine.
Dustin