Header: Add Website Github link

Author: gonX

site/_data/links.json

@@ -13,7 +13,8 @@
     "LatestReleasePage": "https://github.com/OpenTabletDriver/OpenTabletDriver/releases/latest",
     "UpstreamRepo": "https://github.com/OpenTabletDriver/OpenTabletDriver",
     "GitRepo": "https://github.com/OpenTabletDriver/OpenTabletDriver.git",
-    "DiscordInvite": "https://discord.gg/9bcMaPkVAR"
+    "DiscordInvite": "https://discord.gg/9bcMaPkVAR",
+    "WebsiteRepo": "https://github.com/OpenTabletDriver/opentabletdriver.github.io"
   },
   "external": {
     "TabletDriverCleanup": {

site/_includes/header.html

@@ -31,6 +31,9 @@
         <li class="nav-item">
           <a class="nav-link text-light" href="{{ site.data.links.project.DiscordInvite }}">Discord</a>
         </li>
+        <li class="nav-item">
+          <a class="nav-link text-light" href="{{ site.data.links.project.WebsiteRepo }}">Website GitHub</a>
+        </li>
       </ul>
     </div>
   </div>