Add MetaMask mobile GitHub. (#1847)

* Add MetaMask mobile GitHub.

Signed-off-by: bgravenorst <[email protected]>

* Update docusaurus.config.js

---------

Signed-off-by: bgravenorst <[email protected]>
Co-authored-by: Alexandra Carrillo <[email protected]>

Author: bgravenorst

docusaurus.config.js

@@ -288,6 +288,10 @@ const config = {
                 label: "Documentation GitHub",
                 href: "https://github.com/MetaMask/metamask-docs",
               },
+              {
+                label: "MetaMask Mobile GitHub",
+                href: "https://github.com/MetaMask/metamask-mobile",
+              },
               {
                 label: "MetaMask wallet GitHub",
                 href: "https://github.com/MetaMask/metamask-extension/",