add theme configs

Kvantum/kvantum.kvconfig

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+[General]
+theme=LavandaDark

nwg-look/config

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+{
+ "export-settings-ini": true,
+ "export-gtkrc-20": true,
+ "export-index-theme": true,
+ "export-xsettingsd": true
+}

qt5ct/qt5ct.conf

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+[Appearance]
+color_scheme_path=/usr/share/qt5ct/colors/airy.conf
+custom_palette=false
+icon_theme=Flatery-Dark
+standard_dialogs=default
+style=Fusion
+
+[Fonts]
+fixed="Sans Serif,9,-1,5,50,0,0,0,0,0"
+general="Sans Serif,9,-1,5,50,0,0,0,0,0"
+
+[Interface]
+activate_item_on_single_click=1
+buttonbox_layout=3
+cursor_flash_time=1000
+dialog_buttons_have_icons=1
+double_click_interval=400
+gui_effects=@Invalid()
+keyboard_scheme=4
+menus_have_icons=true
+show_shortcuts_in_context_menus=true
+stylesheets=@Invalid()
+toolbutton_style=4
+underline_shortcut=1
+wheel_scroll_lines=3
+
+[SettingsWindow]
+geometry=@ByteArray(\x1\xd9\xd0\xcb\0\x3\0\0\0\0\0\0\0\0\0\0\0\0\x3\xae\0\0\x4\x63\0\0\0\0\0\0\0\0\0\0\x2\xe1\0\0\x3[\0\0\0\0\x2\0\0\0\a\x80\0\0\0\0\0\0\0\0\0\0\x3\xae\0\0\x4\x63)
+
+[Troubleshooting]
+force_raster_widgets=1
+ignored_applications=@Invalid()