Adding Zen Browser matugen template (#1181)

* Adding Zen Browser matugen template

* Fixing indentation for matugen.go edits

* Trying to fix linting again..

* Tweaking contrasting surface colors in css, renamed file to match how firefox userchrome is named, also changed output directory to DMS config directory (like firefox)

* Modifing Zen userChrome again: removing unused css stuff, tweaking colors to better align with how pywalfox handles backgrounds/toolbars

* Last few tweaks on CSS - changing url bar highlight color, changing contrast on selected urls in dropdown

* matugen.go: fix check command for zen browser

* search_index: add zen browser setting

quickshell/translations/settings_search_index.json

@@ -1565,6 +1565,24 @@
       "theme"
     ]
   },
+  {
+    "section": "matugenTemplateZenBrowser",
+    "label": "Zen Browser",
+    "tabIndex": 10,
+    "category": "Theme & Colors",
+    "keywords": [
+      "appearance",
+      "colors",
+      "zen",
+      "zenbrowser",
+      "look",
+      "matugen",
+      "scheme",
+      "style",
+      "template",
+      "theme"
+    ]
+  },
   {
     "section": "matugenTemplateGtk",
     "label": "GTK",