Moved RoutesHandler into settings module

- To keep in convention with settings described in - https://github.com/TryGhost/Ghost/issues/9528 , extracted routes handler into separate settings folder

core/frontend/services/routing/index.js

@@ -17,9 +17,5 @@ module.exports = {
 
     get TaxonomyRouter() {
         return require('./TaxonomyRouter');
-    },
-
-    get settings() {
-        return require('./SettingsHandler');
     }
 };

core/frontend/services/settings/index.js

@@ -0,0 +1,5 @@
+module.exports = {
+    get routes() {
+        return require('./RoutesHandler');
+    }
+};

core/server/api/v2/settings.js

@@ -1,7 +1,7 @@
 const Promise = require('bluebird');
 const _ = require('lodash');
 const models = require('../../models');
-const frontendRouting = require('../../../frontend/services/routing');
+const frontendSettings = require('../../../frontend/services/settings');
 const common = require('../../lib/common');
 const settingsCache = require('../../services/settings/cache');
 
@@ -147,7 +147,7 @@ module.exports = {
             method: 'edit'
         },
         query(frame) {
-            return frontendRouting.settings.activate(frame.file.path);
+            return frontendSettings.routes.activate(frame.file.path);
         }
     },
 
@@ -165,7 +165,7 @@ module.exports = {
             method: 'browse'
         },
         query() {
-            return frontendRouting.settings.serve();
+            return frontendSettings.routes.serve();
         }
     }
 };