Move full description to separate file

ego_description.txt

@@ -0,0 +1,21 @@
+Automatically switch between your light and dark GTK theme variants when Night Light activates.
+
+These themes have been tested and work:
+- Adapta
+- Adwaita
+- Arc
+- Canta
+- Flat-Remix-GTK
+- HighContrast
+- Layan
+- Matcha
+- Materia
+- Mojave
+- Qogir
+- Vimix
+- Yaru
+
+Other themes with a dark variant might work as well, let me know if there is a specific theme you'd like supported!
+
+If you need to change your GNOME shell theme as well, try Night Shell Switcher:
+https://extensions.gnome.org/extension/2356/night-shell-switcher/

src/metadata.json

@@ -1,6 +1,6 @@
 {
 	"name": "Night Theme Switcher",
-	"description": "Automatically change the GTK theme to dark variant when Night Light activates.\n\nTHEME COMPATIBILITY:\nYour theme must have a `-dark` variant, e.g. `Adwaita` and `Adwaita-dark`.\nThese themes have been tested and work:\n- Adapta\n- Adwaita\n- Arc\n- Canta\n- Flat-Remix-GTK\n- HighContrast\n- Layan\n- Matcha\n- Materia\n- Mojave\n- Qogir\n- Vimix\n- Yaru\n\nLet me know if the theme you use works as well, or if it doesn't, I can try to make it work.\n\nDo you need to change your GNOME shell theme as well? Try Night Shell Switcher! https://extensions.gnome.org/extension/2356/night-shell-switcher/",
+	"description": "Automatically switch between your light and dark GTK theme variants when Night Light activates.",
 	"uuid": "nightthemeswitcher@romainvigier.fr",
 	"url": "https://gitlab.com/rmnvgr/nightthemeswitcher-gnome-shell-extension/",
 	"version": 16,