Remove yaru color variant

Closes #535

README.md

@@ -78,7 +78,7 @@ We also have the `beta` branch for fixes only aplicable to the current Firefox b
 	- `-t <theme_name>` *optional*
 		- Set the colors used in the theme.
 		- Default: Adwaita.
-		- Options: `adwaita`, `maia`, `yaru`.
+		- Options: `adwaita`, `maia`.
 
 ### One command curled script
 

theme/colors/dark-yaru.css

@@ -1,15 +0,0 @@
-@namespace xul url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
-
-/* Variables that start with --gnome- are added by me and are assigned
- * to elements somewhere in this code. The rest of the variables are
- * built-in in Firefox, so you need to add an !important if you wanna
- * override them. */
-@media (prefers-color-scheme: dark) {
-	:root {
-	  /* Accent */
-		--gnome-accent: #864780;
-		
-		/* Buttons */
-		--gnome-button-suggested-action-background: linear-gradient(to top, #155099 2px, #864780);
-	}
-}

theme/colors/light-yaru.css

@@ -1,11 +0,0 @@
-@namespace xul url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
-
-/* Variables that start with --gnome- are added by me and are assigned
- * to elements somewhere in this code. The rest of the variables are
- * built-in in Firefox, so you need to add an !important if you wanna
- * override them. */
-
-:root {
-  /* Accent */
-	--gnome-accent: #864780;
-}