Added versions page with links to recent releases

Author: bvaughn

src/components/LayoutHeader/Header.js

@@ -10,9 +10,9 @@ import HeaderLink from './HeaderLink';
 import Link from 'gatsby-link';
 import React from 'react';
 import {colors, fonts, media} from 'theme';
+import {version} from 'site-constants';
 import ExternalLinkSvg from 'templates/components/ExternalLinkSvg';
 import DocSearch from './DocSearch';
-import VersionToggler from './VersionToggler';
 
 import logoSvg from 'icons/logo.svg';
 
@@ -146,7 +146,25 @@ const Header = ({location}: {location: Location}) => (
               width: 'calc(100% / 6)',
             },
           }}>
-          <VersionToggler />
+          <a
+            css={{
+              padding: '5px 10px',
+              whiteSpace: 'nowrap',
+              ...fonts.small,
+
+              ':hover': {
+                color: colors.brand,
+              },
+
+              ':focus': {
+                outline: 0,
+                backgroundColor: colors.lighter,
+                borderRadius: 15,
+              },
+            }}
+            href="/versions">
+            v{version}
+          </a>
           <a
             css={{
               padding: '5px 10px',

src/pages/versions.js

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * @emails react-core
+ * @flow
+ */
+
+import Container from 'components/Container';
+import Header from 'components/Header';
+import TitleAndMetaTags from 'components/TitleAndMetaTags';
+import React from 'react';
+import {sharedStyles} from 'theme';
+
+const Versions = () => (
+  <Container>
+    <div css={sharedStyles.articleLayout.container}>
+      <div css={sharedStyles.articleLayout.content}>
+        <Header>React Versions</Header>
+        <TitleAndMetaTags title="React - Versions" />
+        <div css={sharedStyles.markdown}>
+          <p>
+            A complete release history for React is available{' '}
+            <a
+              href="https://github.com/facebook/react/releases"
+              target="_blank"
+              rel="noopener">
+              in GitHub
+            </a>.
+          </p>
+          <p>Documentation for recent releases can also be accessed below:</p>
+          <ul>
+            <li>
+              <a href="/version/16.2" rel="nofollow">
+                16.2.0
+              </a>
+            </li>
+            <li>
+              <a href="/version/16.1" rel="nofollow">
+                16.1.1
+              </a>
+            </li>
+            <li>
+              <a href="/version/16.0" rel="nofollow">
+                16.0.0
+              </a>
+            </li>
+          </ul>
+        </div>
+      </div>
+    </div>
+  </Container>
+);
+
+export default Versions;