Rename admin dashboard "Git integrations" (#581)

We renamed this to "Git integrations" for some reason, but:

- This feels misleading because these are all webhooks, there is no
integration with `git` itself.
- The subpages still all have a heading `Integrations`


![image](https://github.com/user-attachments/assets/2587d915-804e-4651-9a91-05516b793715)

Author: agjohnson

readthedocsext/theme/templates/projects/edit_base.html

@@ -35,7 +35,7 @@
           <div class="header">{% trans "Building" %}</div>
           <div class="menu">
             <a class="item {% block project_integrations_active %}{% endblock project_integrations_active %}"
-               href="{% url "projects_integrations" project.slug %}">{% trans "Git integrations" %}</a>
+               href="{% url "projects_integrations" project.slug %}">{% trans "Integrations" %}</a>
             <a class="item {% block project_pull_requests_active %}{% endblock project_pull_requests_active %}"
                href="{% url "projects_pull_requests" project.slug %}">{% trans "Pull request builds" %}</a>
             <a class="item {% block project_notifications_active %}{% endblock project_notifications_active %}"