GitHub App: link to app from import page (#606)

The code template tag and setting will be added in
readthedocs/readthedocs.org#12217 once we agree
if we are okay with this change.

![Screenshot 2025-05-29 at 16-08-41 Add project - Read the Docs
Dev](https://github.com/user-attachments/assets/f97772ea-40b3-4e80-a690-7ce200d37bb0)
![Screenshot 2025-05-29 at 16-08-35 Add project - Read the Docs
Dev](https://github.com/user-attachments/assets/ced7e8f0-e398-4569-970e-7cf621abb38c)

Author: stsewd

readthedocsext/theme/templates/projects/partials/project_create_automatic.html

@@ -1,4 +1,5 @@
 {% load trans blocktrans from i18n %}
+{% load user_has_github_app_account from readthedocs.socialaccounts %}
 
 {% comment rst %}
   Project automatic configuration view
@@ -99,15 +100,26 @@
 
     </div>
     <div class="ui small bottom attached center aligned message">
+      <p>{% trans "Can't find the repository you are searching for?" %}</p>
 
-      {% trans "Can't find the repository you are searching for?" %}
+      <p>
+        {% if user|user_has_github_app_account %}
+          <a class="ui mini black basic compact button"
+             href="https://github.com/apps/{{ GITHUB_APP_NAME }}/installations/new/"
+             target="_blank">
+            <i class="fa-brands fa-github icon"></i>
+            {% trans "Update GitHub App permissions" %}
+          </a>
 
-      <button class="ui mini black basic compact right aligned button"
-              data-bind="click: sync_remote_repos, css: {disabled: is_syncing(), loading: is_syncing()}">
-        <i class="fa-duotone fa-refresh icon"></i>
-        {% trans "Refresh your repositories" %}
-      </button>
+          {% trans "or" %}
+        {% endif %}
 
+        <button class="ui mini black basic compact button"
+                data-bind="click: sync_remote_repos, css: {disabled: is_syncing(), loading: is_syncing()}">
+          <i class="fa-duotone fa-refresh icon"></i>
+          {% trans "Refresh your repositories" %}
+        </button>
+      </p>
     </div>
   </div>
 {% endblock project_add_automatic_placeholder %}