Reduce Walker config to overrides + adhere to system font (#620)

* Reduce to only have overrides

* Change font to pick up system font

* Add migration

* Add walker restart to pick up new font

bin/omarchy-font-set

@@ -14,6 +14,7 @@ if [[ -n "$font_name" && "$font_name" != "CNCLD" ]]; then
 
     ~/.local/share/omarchy/bin/omarchy-restart-waybar
     ~/.local/share/omarchy/bin/omarchy-restart-swayosd
+    ~/.local/share/omarchy/bin/omarchy-restart-walker
   else
     echo "Font '$font_name' not found."
     exit 1