MC-15083: Resolve performance issues

- Restore tinymce.css for usage within Page Builder

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/form/element/tinymce.css

@@ -0,0 +1,133 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+@font-face {
+    font-family: 'Open Sans';
+    font-style: normal;
+    font-weight: 300;
+    src: url('../../../../fonts/opensans/light/opensans-300.woff2') format('woff2'), url('../../../../fonts/opensans/light/opensans-300.woff') format('woff');
+}
+
+@font-face {
+    font-family: 'Open Sans';
+    font-style: normal;
+    font-weight: 400;
+    src: url('../../../../fonts/opensans/regular/opensans-400.woff2') format('woff2'), url('../../../../fonts/opensans/regular/opensans-400.woff') format('woff');
+}
+
+@font-face {
+    font-family: 'Open Sans';
+    font-style: normal;
+    font-weight: 600;
+    src: url('../../../../fonts/opensans/semibold/opensans-600.woff2') format('woff2'), url('../../../../fonts/opensans/semibold/opensans-600.woff') format('woff');
+}
+
+@font-face {
+    font-family: 'Open Sans';
+    font-style: normal;
+    font-weight: 700;
+    src: url('../../../../fonts/opensans/bold/opensans-700.woff2') format('woff2'), url('../../../../fonts/opensans/bold/opensans-700.woff') format('woff');
+}
+
+h1 {
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 40px;
+    font-style: normal;
+    font-weight: 300;
+    line-height: 44px;
+    margin-bottom: 40px;
+    margin-top: 0px;
+}
+
+h2 {
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 26px;
+    font-style: normal;
+    font-weight: 300;
+    line-height: 1.1;
+    margin-bottom: 20px;
+    margin-top: 25px;
+}
+
+h3 {
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 18px;
+    font-style: normal;
+    font-weight: 600;
+    line-height: 1.1;
+    margin-bottom: 10px;
+    margin-top: 20px;
+}
+
+h4 {
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 14px;
+    font-style: normal;
+    font-weight: 700;
+    line-height: 1.1;
+    margin-bottom: 20px;
+    margin-top: 20px;
+}
+
+h5 {
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 12px;
+    font-style: normal;
+    font-weight: 700;
+    line-height: 1.1;
+    margin-bottom: 20px;
+    margin-top: 20px;
+}
+
+h6 {
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 10px;
+    font-style: normal;
+    font-weight: 700;
+    line-height: 1.1;
+    margin-bottom: 20px;
+    margin-top: 20px;
+}
+
+p {
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 14px;
+    font-style: normal;
+    font-weight: 400;
+    line-height: 20px;
+    margin-bottom: 10px;
+}
+
+pre {
+    background-color: #f6f6f6;
+    border: 1px solid #ccc;
+    color: #111;
+    font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
+    font-size: 12px;
+    font-style: normal;
+    font-weight: 400;
+    line-height: 1.1;
+    margin-bottom: 10px;
+    padding: 10px;
+}
+
+.cms-content-important {
+    background-color: #f5f5f5;
+    color: #333;
+    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    font-size: 22px;
+    font-style: normal;
+    font-weight: 300;
+    line-height: 1.1;
+    margin: 0 0 35px -20px;
+    padding: 20px;
+}