Revert "download: Add temporary banner for Slicer 5.8"

This reverts commit 931cc7d.

Author: ebrahimebrahim

download.markdown

@@ -35,21 +35,6 @@ animated_navbar: false
       </div>
     </div>
 {% else %}
- <!-- TEMPORARY BANNER to be removed when 5.10 is more completely stable extension-wise. -->
-    <div class="columns is-mobile is-centered has-text-centered">
-
-      <div class="column is-12">
-        <div class="notification is-warning">
-            <p class="title is-4">
-            Access to previous stable release
-            </p>
-            <p class="content">
-            Slicer 5.10 is the new stable release. Some extensions are still being updated and may be missing. If you need access to the previous stable release Slicer 5.8, see <a href="https://download.slicer.org/?revision=33241">this download page</a>.
-            </p>
-        </div>
-      </div>
-    </div>
- <!-- End TEMPORARY BANNER -->
     <!-- This section contains jinja2 templates intended to be used in https://github.com/Slicer/slicer_download -->
     <div class="columns is-mobile is-centered">
         <table class="installers column is-three-quarters">