refactor: unify desktop apps and Settings under item catalog

programs/data/config/config-applets.toml

@@ -1,17 +0,0 @@
-[applets.printers]
-label = "Printers"
-library = "0:/os/printersapplet.lib"
-icon = "0:/icons/printer.svg"
-enabled = true
-
-[applets.network]
-label = "Network"
-library = "0:/os/networkapplet.lib"
-icon = "0:/icons/network-wired.svg"
-enabled = true
-
-[applets.timezone]
-label = "Time Zone"
-library = "0:/os/timezonesapplet.lib"
-icon = "0:/icons/preferences-system-time.svg"
-enabled = true