Add remaining copyright headers (jestjs#7263)

Author: rubennorte

jest.config.ci.js

@@ -1,3 +1,5 @@
+// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+
 'use strict';
 
 // Object spread is just node 8

jest.config.js

@@ -1,3 +1,5 @@
+// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+
 'use strict';
 
 module.exports = {

website/static/css/custom.css

@@ -1,3 +1,5 @@
+/* Copyright (c) 2014-present, Facebook, Inc. All rights reserved. */
+
 .fixedHeaderContainer header img.logo {
 	height: 60px;
 	margin-top: -20px;

website/static/css/jest.css

@@ -1,3 +1,5 @@
+/* Copyright (c) 2014-present, Facebook, Inc. All rights reserved. */
+
 .sponsor-item {
   margin: 10px;
 }