move xdg directories to the default location.

a lot of applications seem to hardcode this location, so it's better to
have something default, or default-adjasoned.

.config/picom.conf

@@ -0,0 +1,33 @@
+backend = "glx";
+vsync = true;
+shadow = false;
+
+fading = true;
+fade-delta = 5;
+fade-in-step = 0.03;
+fade-out-step = 0.03;
+
+opacity-rule = [
+	"100:class_g = 'i3-frame'"
+];
+
+blur-background-exclude = [
+	"name        *= 'Screenshot'",
+	"class_g     ~= 'slop'",
+	"class_g     ~= 'obs'",
+	"class_g     ~= 'Peek'",
+	"window_type  = 'dock'",
+	"window_type  = 'desktop'",
+	"window_type  = 'notification'",
+	"window_type  = 'tooltip'",
+	"window_type  = 'menu'",
+	"window_type  = 'popup_menu'",
+]
+
+blur-method = "dual_kawase";
+blur-strength = 5;
+
+corner-radius = 0;
+
+# avoid GPU artefacts with some drivers
+use-damage = true;