add warpd-based mouse movement mode

conf.d/mode_mouse.conf

@@ -0,0 +1,10 @@
+# use keyboard as mouse with warpd
+bindsym $mod+semicolon mode "mouse"
+mode "mouse" {
+    bindsym x mode default, exec warpd --hint
+    bindsym c mode default, exec warpd --normal
+    bindsym g mode default, exec warpd --grid
+    
+    bindsym Return mode "default"
+    bindsym Escape mode "default"
+}