add web3dsurvey

Author: greggman

build/templates/index.template

@@ -98,6 +98,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 </div>
 {{{include "build/templates/repobanner.template"}}}
 <iframe class="background" src="/webgl/background.html"></iframe>
+<iframe src="https://web3dsurvey.com/collector-iframe.html" style="position: absolute; right: 0; top: 0; width: 1px; height: 1px;"></iframe>
 </body>
 <script>
 const settings = {