feat: add data api link

Author: CallumNZ

ui/geonet_header/header.html

@@ -146,6 +146,7 @@
               <a class="dropdown-item external-link" href="https://api.geonet.org.nz" rel="external" target="_blank"> GeoNet API </a>
               <a class="dropdown-item external-link" href="https://tilde.geonet.org.nz" rel="external" target="_blank"> Tilde Time Series API </a>
               <a class="dropdown-item external-link" href="https://shakinglayers.geonet.org.nz/api" rel="external" target="_blank"> Shaking Layers API </a>
+              <a class="dropdown-item external-link" href="https://data.geonet.org.nz" rel="external" target="_blank"> Data API </a>
               <a class="dropdown-item" href="{{.Origin}}/data/access/aws"> AWS Open Data </a>
               <!-- <a class="dropdown-item" href=""> Data Support </a>  TODO: Page to be created-->
               <a class="dropdown-item" href="{{.Origin}}/data/access/tutorials"> Data Tutorials </a>
@@ -177,4 +178,4 @@
       </div>
     </div>
 </nav>
-{{end}}
+{{end}}