[GTK] Update GTK2 and GTK3 config

GTK2 finally gets its gtkrc file, and both file now use the Nord theme

org/config/index.org

@@ -96,11 +96,42 @@
     :END:
 **** GTK2
      :PROPERTIES:
-     :HEADER-ARGS: :tangle ~/.config/gtk-2.0/gtkfilechooser.ini
      :CUSTOM_ID: Features-Graphical_tweaks-GTK_Settings-GTK2-74c9de24
      :END:
-     Regarding  GTK2, I  have  only one  configuration  file: the  filechooser’s
-     configuration file.
+***** General configuration
+      :PROPERTIES:
+      :HEADER-ARGS: :tangle ~/.gtkrc-2.0
+      :CUSTOM_ID: Features-Graphical_tweaks-GTK_Settings-GTK2-General_configuration-eb1f1f3c
+      :END:
+      This file is tangled at ~$HOME/.gtkrc-2.0~.  This is an equivalent for the
+      GTK3 configuration  file you  will see  below, and it  shares most  of its
+      settings. First,  let’s select the Nordic  theme for GTK2. Let’s  also set
+      the icon theme.
+      #+BEGIN_SRC conf-unix
+        # -*- mode: unix-config -*-
+        gtk-theme-name="Nordic"
+        gtk-icon-theme-name="Flat-Remix-Dark"
+      #+END_SRC
+
+      #+BEGIN_SRC conf-unix
+        gtk-xft-antialias=1
+        gtk-xft-hinting=1
+        gtk-xft-hintstyle="hintslight"
+      #+END_SRC
+
+      This changes the shortcuts in menu, let’s also make the menus snappier.
+      #+BEGIN_SRC conf-unix
+        gtk-can-change-accels=1
+        gtk-menu-bar-popup-delay=0
+        gtk-menu-popdown-delay=0
+        gtk-menu-popup-delay=0
+      #+END_SRC
+
+***** Filechooser
+      :PROPERTIES:
+      :HEADER-ARGS: :tangle ~/.config/gtk-2.0/gtkfilechooser.ini
+      :CUSTOM_ID: Features-Graphical_tweaks-GTK_Settings-GTK2-Filechooser-389f040d
+      :END:
       #+BEGIN_SRC conf-unix
         [Filechooser Settings]
       #+END_SRC
@@ -181,13 +212,16 @@
        gtk-icon-theme-name = Flat-Remix-Dark
      #+END_SRC
 
-     Now, the general theme for GTK3 is Arc Dark.
+     Now, the general theme for GTK3 is Nordic.
      #+BEGIN_SRC conf-unix
-       gtk-theme-name = Arc-Dark
+       gtk-theme-name = Nordic
      #+END_SRC
 
      #+BEGIN_SRC conf-unix
        gtk-can-change-accels=1
+       gtk-menu-bar-popup-delay=0
+       gtk-menu-popdown-delay=0
+       gtk-menu-popup-delay=0
      #+END_SRC
 
      #+BEGIN_SRC conf-unix