chore: Remove empty firmware page

This page will be re-added later, but the empty page and its desktop file need to be removed before release to not confuse people.

resources/applications/com.system76.CosmicSettings.Firmware.desktop

@@ -1,32 +0,0 @@
-[Desktop Entry]
-Name=Firmware
-Name[ar]=البرامج الثابتة
-Name[cs]=Firmware
-Name[zh_CN]=固件
-Name[pl]=Oprogramowanie sprzętowe
-Name[hu]=Firmware
-Name[pt]=Firmware
-Name[sk]=Firmware
-Name[sv]=Fast programvara
-Name[es]=Firmware
-Comment=View and update firmware.
-Comment[ar]=عرض وتحديث البرامج الثابتة.
-Comment[cs]=Zobrazit a aktualizovat firmware.
-Comment[zh_CN]=查看和更新固件
-Comment[pl]=Zobacz i aktualizuj oprogramowanie sprzętowe.
-Comment[hu]=Firmware megtekintése és frissítése.
-Comment[pt]=Visualizar e atualizar firmware.
-Comment[nl]=Firmware bekijken en bijwerken.
-Comment[af]=Bekyk en werk firmware op.
-Comment[sk]=Zobraziť a aktualizovať firmware.
-Comment[sv]=Visa och updatera fast programvara.
-Comment[es]=Ver y actualizar firmware.
-Type=Application
-Exec=cosmic-settings firmware
-Terminal=false
-Categories=COSMIC
-Keywords=COSMIC
-NoDisplay=true
-OnlyShowIn=COSMIC
-Icon=com.system76.CosmicSettings
-StartupNotify=true