refactor start form

app/javascript/template_builder/builder.vue

@@ -110,7 +110,7 @@
             data-turbo="false"
             class="inline"
             method="post"
-            :action="`/d/${template.slug}`"
+            :action="`/start_form_self/${template.id}`"
             @submit="maybeShowErrorTemplateAlert"
           >
             <input
@@ -125,12 +125,6 @@
               :value="authenticityToken"
               autocomplete="off"
             >
-            <input
-              type="hidden"
-              name="selfsign"
-              value="true"
-              autocomplete="off"
-            >
             <button
               class="btn btn-primary btn-ghost text-base hidden md:flex"
               type="submit"