Remove chrome_style & browser_style manifest keys

The chrome_style CSS stylesheet applied by Chrome to the options page is
now included directly in the extension's bundle, and injected into the
options page.

This change is done in preparation for Manifest Version 3, which doesn't
allow setting chrome_style to true:
https://source.chromium.org/chromium/chromium/src/+/master:extensions/common/api/extensions_manifest_types.json;l=94;drc=149f67d78acea93b3d4f28bcd8e594301e1fdb08

This change also moves the options resources to their own folder.

Change-Id: I88d74989b38053d2e137ff166ddcdc4e00489428
diff --git a/templates/manifest.gjson b/templates/manifest.gjson
index 8d93b2e..bbb65eb 100644
--- a/templates/manifest.gjson
+++ b/templates/manifest.gjson
@@ -49,23 +49,13 @@
     "storage"
   ],
   "web_accessible_resources": [
-    "injections/profileindicator_inject.js",
-    "injections/profileindicator_inject.css",
-    "injections/ccdarktheme.css",
-    "injections/batchlock_inject.js"
   ],
   "browser_action": {},
 #if defined(CHROMIUM)
-  "options_page": "options.html",
+  "options_page": "options/options.html",
 #endif
   "options_ui": {
-    "page": "options.html",
-#if defined(CHROMIUM)
-    "chrome_style": true,
-#endif
-#if defined(GECKO)
-    "browser_style": true,
-#endif
+    "page": "options/options.html",
     "open_in_tab": false
   },
   "background": {