[v1.9.x] Fix css for Apache links, add to Python docs. (apache#20995)

* Add Apache links to python docs footer, update hostname in CI script.

* Don't use relative_url function.

* Add link to ASF.

docs/python_docs/themes/mx-theme/mxtheme/footer.html

@@ -1,7 +1,7 @@
 <footer class="site-footer h-card">
     <div class="wrapper">
         <div class="row">
-            <div class="col-4">
+            <div class="col-3">
                 <h4 class="footer-category-title">Resources</h4>
                 <ul class="contact-list">
                     <li><a
@@ -14,11 +14,22 @@ <h4 class="footer-category-title">Resources</h4>
 
                 </ul>
             </div>
+            <div class="col-3">
+                <h4 class="footer-category-title">Apache</h4>
+                <ul class="apache-list">
+                    <li><a href="https://www.apache.org/foundation/">Foundation</a></li>
+                    <li><a href="https://www.apache.org/foundation/sponsorship.html">Sponsorship</a></li>
+                    <li><a href="/api/faq/security.html">Security</a></li>
+                    <li><a href="https://www.apache.org/licenses/">License</a></li>
+                    <li><a href="https://www.apache.org/events/current-event">Events</a></li>
+                    <li><a href="https://www.apache.org/foundation/thanks.html">Thanks</a></li>
+                </ul>
+            </div>
 
-            <div class="col-4"><ul class="social-media-list"><li><a href="https://github.com/apache/incubator-mxnet"><svg class="svg-icon"><use xlink:href="{{pathto('_static/minima-social-icons.svg#github', 1)}}"></use></svg> <span class="username">apache/incubator-mxnet</span></a></li><li><a href="https://www.twitter.com/apachemxnet"><svg class="svg-icon"><use xlink:href="{{pathto('_static/minima-social-icons.svg#twitter', 1)}}"></use></svg> <span class="username">apachemxnet</span></a></li><li><a href="https://youtube.com/apachemxnet"><svg class="svg-icon"><use xlink:href="{{pathto('_static/minima-social-icons.svg#youtube', 1)}}"></use></svg> <span class="username">apachemxnet</span></a></li></ul>
+            <div class="col-3"><ul class="social-media-list"><li><a href="https://github.com/apache/incubator-mxnet"><svg class="svg-icon"><use xlink:href="{{pathto('_static/minima-social-icons.svg#github', 1)}}"></use></svg> <span class="username">apache/incubator-mxnet</span></a></li><li><a href="https://www.twitter.com/apachemxnet"><svg class="svg-icon"><use xlink:href="{{pathto('_static/minima-social-icons.svg#twitter', 1)}}"></use></svg> <span class="username">apachemxnet</span></a></li><li><a href="https://youtube.com/apachemxnet"><svg class="svg-icon"><use xlink:href="{{pathto('_static/minima-social-icons.svg#youtube', 1)}}"></use></svg> <span class="username">apachemxnet</span></a></li></ul>
 </div>
 
-            <div class="col-4 footer-text">
+            <div class="col-3 footer-text">
                 <p>A flexible and efficient library for deep learning.</p>
             </div>
         </div>
@@ -32,7 +43,7 @@ <h4 class="footer-category-title">Resources</h4>
                 <img src="{{pathto('_static/apache_incubator_logo.png', 1)}}" class="footer-logo col-2">
             </div>
             <div class="footer-bottom-warning col-9">
-                <p>Apache MXNet is an effort undergoing incubation at The Apache Software Foundation (ASF), <span style="font-weight:bold">sponsored by the <i>Apache Incubator</i></span>. Incubation is required
+                <p>Apache MXNet is an effort undergoing incubation at <a href="http://www.apache.org/">The Apache Software Foundation</a> (ASF), <span style="font-weight:bold">sponsored by the <i>Apache Incubator</i></span>. Incubation is required
                     of all newly accepted projects until a further review indicates that the infrastructure,
                     communications, and decision making process have stabilized in a manner consistent with other
                     successful ASF projects. While incubation status is not necessarily a reflection of the completeness

docs/python_docs/themes/mx-theme/src/scss/footer/_footer.scss

@@ -147,6 +147,7 @@ footer.mdl-mini-footer {
 }
 
 .contact-list,
+.apache-list,
 .social-media-list {
   list-style: none;
   margin-left: 0;