Add split navigation

client/layouts/split-navigation/Cover.jsx

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+import React from 'react';
+
+import Frame from '../../placeholders/Frame';
+import Rectangle from '../../placeholders/Rectangle';
+
+const Cover = () => {
+    return (
+        <Frame>
+            <div className="h-100 flex flex-column items-center justify-center">
+                <div className="flex items-center w-80 b--black-30 ba br2 pa1">
+                    <div className="w1 mr1"><Rectangle /></div>
+                    <div className="w1 mr1"><Rectangle /></div>
+                    <div className="w1 ml-auto"><Rectangle /></div>
+                </div>
+            </div>
+        </Frame>
+    );
+};
+
+export default Cover;

client/layouts/split-navigation/Details.jsx

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+import React from 'react';
+
+import DetailsLayout from '../../DetailsLayout';
+import BrowserFrame from '../../placeholders/BrowserFrame';
+import Rectangle from '../../placeholders/Rectangle';
+import SampleCode from '../../SampleCode';
+
+const Details = () => {
+    return (
+        <DetailsLayout title="Split navigation">
+            <BrowserFrame
+                content={
+                    <div className="h-100 flex flex-column items-center justify-center">
+                        <ul className="list ma0 b--black-30 ba br3 flex items-center pa3 w-60">
+                            <li className="w-20 mr1"><Rectangle /></li>
+                            <li className="w-10 mr1"><Rectangle /></li>
+                            <li className="w-20 mr1"><Rectangle /></li>
+                            <li className="w-10 ml-auto"><Rectangle /></li>
+                        </ul>
+                    </div>
+                }
+                source={
+<SampleCode
+lang="html"
+code={`
+<ul style="
+    /* Content is centered horizontally */
+    align-items: center;
+    display: flex;
+
+    /* Reset styles */
+    list-stype-type: none;
+    margin: 0;
+">
+    <!-- Navigation item -->
+    <li>
+        <a href="">...</a>
+    </li>
+
+    <!-- Navigation item that sticks to the right -->
+    <li style="
+        /* Sticks to the right */
+        margin-left: auto;
+    ">
+        <a href="">...</a>
+    </li>
+</ul>
+`}
+/>
+                }
+            />
+        </DetailsLayout>
+    );
+};
+
+export default Details;