Convert last-horizon and solitude themes from hyprlang to Lua (#5867)

themes/solitude/hyprland.lua

@@ -0,0 +1,17 @@
+local active_border_color = "rgba(798186ee) rgba(caccccee)"
+local inactive_border_color = "rgb(1e1e1e)"
+
+hl.config({
+  general = {
+    col = {
+      active_border = active_border_color,
+      inactive_border = inactive_border_color,
+    },
+  },
+  group = {
+    col = {
+      border_active = active_border_color,
+      border_inactive = inactive_border_color,
+    },
+  },
+})