add create instance form dialog

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

index.html

@@ -20,7 +20,7 @@
 			<div id="instance-container" class="center-div">
 			</div>
 			<div class="center-div" style="text-align: center;">
-				<img id="disk-add" src="images/actions/instance/add-instance.svg" class="clickable" alt="Create New Instance" title="Create New Instance">
+				<img id="instance-add" src="images/actions/instance/add-instance.svg" class="clickable" alt="Create New Instance" title="Create New Instance">
 			</div>
 		</main>
 	</body>