add systemd timers for periodic fixes

systemd/timers/fix-flatpaks-theming.timer

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+# This timer unit is for fix-flatpaks-theming service unit
+#
+
+[Unit]
+Description=Run fix flatpaks theming script every 600 seconds
+Requires=fix-flatpaks-theming.service
+
+[Timer]
+Unit=fix-flatpaks-theming.service
+OnBootSec=1
+OnUnitActiveSec=600
+
+[Install]
+WantedBy=timers.target

systemd/timers/fix-theming.timer

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+# This timer unit is for fix-theming service unit
+#
+
+[Unit]
+Description=Run fix theming script every 3 seconds
+Requires=fix-theming.service
+
+[Timer]
+Unit=fix-theming.service
+OnBootSec=1
+OnUnitActiveSec=3
+
+[Install]
+WantedBy=timers.target

systemd/timers/fix-tweaked-desktop-files.timer

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+# This timer unit is for fix-tweaked-desktop-files service unit
+#
+
+[Unit]
+Description=Run fix tweaked desktop files script every 5 seconds
+Requires=fix-tweaked-desktop-files.service
+
+[Timer]
+Unit=ffix-tweaked-desktop-files.service
+OnBootSec=1
+OnUnitActiveSec=5
+
+[Install]
+WantedBy=timers.target