frontend: add integration for adservice

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

src/frontend/templates/ad.html

@@ -0,0 +1,10 @@
+{{ define "text_ad" }}
+<div class="container">
+    <div class="alert alert-dark" role="alert">
+        <strong>Advertisement:</strong>
+        <a href="{{.RedirectUrl}}" rel="nofollow" target="_blank" class="alert-link">
+            {{.Text}}
+        </a>
+    </div>
+</div>
+{{ end }}

src/frontend/templates/home.html

@@ -51,6 +51,9 @@
                 </div>
                 {{ end }}
             </div>
+            <div class="row">
+                {{ with $.ad }}{{ template "text_ad" . }}{{ end}}
+            </div>
             </div>
         </div>
     </main>

src/frontend/templates/product.html

@@ -47,9 +47,10 @@
                     {{ template "recommendations" $.recommendations }}
                 {{ end }}
                 
+                {{ with $.ad }}{{ template "text_ad" . }}{{ end}}
             </div>
         </div>
+    
     </main>
-
     {{ template "footer" . }}
 {{ end }}