Cleaned up AMP rendering of "page" resources

refs https://github.com/TryGhost/Toolbox/issues/332

- After dropping support for `page: (true|false)` for post resources in Content API there is no need to check for `body.post.page` in the AMP renderer. Furthermore, the AMP router uses `public-post` controller that **only** returns "post" resources. This check was a redundant, unnecessary piece of logic

core/frontend/apps/amp/lib/router.js

@@ -26,8 +26,7 @@ function _renderer(req, res, next) {
     // Format data
     let body = req.body || {};
 
-    // CASE: we only support amp pages for posts that are not static pages
+    if (!body.post) {
-    if (!body.post || body.post.page) {
         return next(new errors.NotFoundError({message: tpl(messages.pageNotFound)}));
     }
 
@@ -70,7 +69,7 @@ function getPostData(req, res, next) {
         }));
     }
 
-    // @NOTE: amp is not supported for static pages
+    // @NOTE: amp is not supported for "page" resource
     // @TODO: https://github.com/TryGhost/Ghost/issues/10548
     dataService.entryLookup(urlWithoutSubdirectoryWithoutAmp, {permalinks, query: {controller: 'postsPublic', resource: 'posts'}}, res.locals)
         .then((result) => {

test/unit/frontend/apps/amp/router.test.js

@@ -77,20 +77,6 @@ describe('Unit - apps/amp/lib/router', function () {
                 done();
             });
         });
-
-        it('throws 404 when req.body.post is a page', function (done) {
-            req.body = {
-                post: {
-                    page: true
-                }
-            };
-
-            ampController.renderer(req, res, function (err) {
-                (err instanceof errors.NotFoundError).should.be.true();
-                renderer.renderer.called.should.be.false();
-                done();
-            });
-        });
     });
 
     describe('fn: getPostData', function () {