[2.5] Add Eol banner to all pages (#59810)

* add eol banner (#59254)

(cherry picked from commit 00699735e9)

docs/docsite/_themes/sphinx_rtd_theme/ansible_eol_banner.html

@@ -0,0 +1,4 @@
+{# Creates a banner at the top of the page for EOL versions. #}
+<div id='banner' class='Admonition caution'>
+  <p>You are reading an unmaintained version of the Ansible documentation. Unmaintained Ansible versions can contain unfixed security vulnerabilities (CVE). Please upgrade to a maintained version. See <a href="https://docs.ansible.com/ansible/latest/index.html">the latest Ansible documentation</a>.</p>
+</div>

docs/docsite/_themes/sphinx_rtd_theme/layout.html

@@ -237,6 +237,8 @@
         </div> -->
 
           {% include "breadcrumbs.html" %}
+          
+          {% include "ansible_eol_banner.html" %}
           <div id="page-content">
           {% block body %}{% endblock %}
           </div>