Adds manifest.json to examples folder (#3536)

* Revert "Revert "[examples] Add manifest.json""

This reverts commit c65336e63b.

* Revert "Revert "Do not use now-examples anymore""

This reverts commit ac72e944a7.

* Update nowignore

* Fix join

* Fix JSON

* Fix header

* Replace manifest.json with @now/frameworks

* Adjust readmes

* Adjust .nowignore

* Update scully

* Fix description

* Update examples/create-react-app/src/App.js

Co-Authored-By: Shu Ding <ds303077135@gmail.com>

* Update readme

* Add websites

* Use https

* Adjust example URL

* Change order

Co-authored-by: Shu Ding <ds303077135@gmail.com>

examples/create-react-app/src/App.css

@@ -1,33 +1,44 @@
-.App {
+main {
+  align-content: center;
+  box-sizing: border-box;
+  display: grid;
+  font-family: 'SF Pro Text', 'SF Pro Icons', 'Helvetica Neue', 'Helvetica',
+    'Arial', sans-serif;
+  hyphens: auto;
+  line-height: 1.65;
+  margin: 0 auto;
+  max-width: 680px;
+  min-height: 100vh;
+  padding: 72px 0;
   text-align: center;
 }
-
-.App-logo {
-  animation: App-logo-spin infinite 20s linear;
-  height: 40vmin;
-  pointer-events: none;
+h1 {
+  font-size: 45px;
 }
-
-.App-header {
-  background-color: #282c34;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  font-size: calc(10px + 2vmin);
-  color: white;
+h2 {
+  margin-top: 1.5em;
 }
-
-.App-link {
-  color: #61dafb;
+p {
+  font-size: 16px;
 }
-
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
+a {
+  border-bottom: 1px solid white;
+  color: #0076ff;
+  cursor: pointer;
+  text-decoration: none;
+  transition: all 0.2s ease;
+}
+a:hover {
+  border-bottom: 1px solid #0076ff;
+}
+code,
+pre {
+  color: #d400ff;
+  font-family: Menlo, Monaco, Lucida Console, Liberation Mono, DejaVu Sans Mono,
+    Bitstream Vera Sans Mono, Courier New, monospace, serif;
+  font-size: 0.92em;
+}
+code:before,
+code:after {
+  content: '\`';
 }