Added alias for non-versioned API endpoints

refs https://github.com/TryGhost/Toolbox/issues/169

- Before next major version release we need to prepare for removal of API versioning.
- This change allows unversioned API requests to work under following endpoints:
- /ghost/api/admin
- /ghost/api/content
- This change should allow further preparation of the API clients (SDKs, Integrations, etc.) to non-versioned APIs in Ghost instances in ^5.0.0
- Changed default e2e test targets to non-versioned API. It's a trial, to have working examples. In the future all tests should switch to use only non-versioned endpoints.

core/server/web/api/app.js

@@ -25,6 +25,9 @@ module.exports = function setupApiApp() {
     apiApp.lazyUse(urlUtils.getVersionPath({version: 'canary', type: 'content'}), require('./canary/content/app'));
     apiApp.lazyUse(urlUtils.getVersionPath({version: 'canary', type: 'admin'}), require('./canary/admin/app'));
 
+    apiApp.lazyUse('/content/', require('./canary/content/app'));
+    apiApp.lazyUse('/admin/', require('./canary/admin/app'));
+
     // Error handling for requests to non-existent API versions
     apiApp.use(errorHandler.resourceNotFound);
     apiApp.use(errorHandler.handleJSONResponse(sentry));

test/e2e-api/admin/utils.js

@@ -7,7 +7,7 @@ const testUtils = require('../../utils');
 //       the commit introducing this comment.
 const schema = require('../../../core/server/data/schema').tables;
 
-const API_URL = '/ghost/api/canary/admin/';
+const API_URL = '/ghost/api/admin/';
 
 const expectedProperties = {
     // API top level

test/e2e-api/content/utils.js

@@ -2,7 +2,7 @@ const url = require('url');
 const _ = require('lodash');
 const testUtils = require('../../utils');
 
-const API_URL = '/ghost/api/canary/content/';
+const API_URL = '/ghost/api/content/';
 
 const expectedProperties = {
     // API top level