[website] add legal stuff

Summary: 'tis the law.

Reviewed By: ezgicicek

Differential Revision: D23572572

fbshipit-source-id: 872e12d32

website/docusaurus.config.js

@@ -69,6 +69,24 @@ module.exports = {
             { label: "Facebook", href: "https://www.facebook.com/inferstaticanalyzer" },
           ],
         },
+        {
+          title: 'Legal',
+          // Please do not remove the privacy and terms, it's a legal requirement.
+          items: [
+            {
+              label: 'Privacy',
+              href: 'https://opensource.facebook.com/legal/privacy/',
+              target: '_blank',
+              rel: 'noreferrer noopener',
+            },
+            {
+              label: 'Terms',
+              href: 'https://opensource.facebook.com/legal/terms/',
+              target: '_blank',
+              rel: 'noreferrer noopener',
+            },
+          ],
+        },
       ],
       copyright: `Copyright © ${new Date().getFullYear()} Facebook, Inc. Built with Docusaurus.`,
     },