Everything: Switch to MATE, Arc, and Solarized

TODO: Add MATE configs, wherever those are

.config/gtk-3.0/settings.ini

@@ -7,5 +7,12 @@ gtk-font-name=Noto Sans Regular 10
 gtk-icon-theme-name=Papirus-Dark
 gtk-menu-images=1
 gtk-primary-button-warps-slider=0
-gtk-theme-name=gruvbox-gtk
+gtk-theme-name=Arc-Dark
 gtk-toolbar-style=GTK_TOOLBAR_ICONS
+gtk-cursor-theme-size=0
+gtk-toolbar-icon-size=GTK_ICON_SIZE_LARGE_TOOLBAR
+gtk-enable-event-sounds=1
+gtk-enable-input-feedback-sounds=1
+gtk-xft-antialias=1
+gtk-xft-hinting=1
+gtk-xft-hintstyle=hintfull