meta: Remove gtk

Now that I use GNOME that manages things with gsettings, this should no
longer be needed.

gtk/.config/gtk-3.0/settings.ini

@@ -1,11 +0,0 @@
-[Settings]
-gtk-cursor-theme-name=phinger-cursors
-gtk-decoration-layout=menu:
-gtk-font-name=Noto Sans CJK JP 11
-gtk-icon-theme-name=flattrcolor-dark
-gtk-theme-name=FlatColor
-gtk-xft-antialias=1
-gtk-xft-hinting=1
-gtk-xft-hintstyle=hintfull
-gtk-xft-rgba=rgb
-gtk-recent-files-enabled=false

gtk/README.md

@@ -1,18 +0,0 @@
-# gtk-settings
-
-[GTK][gtk] is the widget toolkit used by Firefox, Electron, and many (if not all) GNOME applications.
-
-GTK's `settings.ini` only affects window managers and not the GNOME desktop environment. This is because GNOME manages user preferences with [`dconf` through `gsettings`][gnome].
-
-## Use Cases
-
-gtk-settings can be used to:
-
-- Control the appearance of GTK applications under non-GNOME environments
-
-You do not need to use gtk-settings if:
-
-- You are using the GNOME desktop environment
-
-[gtk]: https://wiki.archlinux.org/index.php/GTK+
-[gnome]: https://wiki.archlinux.org/index.php/GNOME#Configuration