Make 'latest' remain in URL instead of 9_0 (#846)

(cherry picked from commit 4896773)

solr/solr-ref-guide/playbook.template.yml

@@ -21,7 +21,7 @@ urls:
   latest_version_segment: latest
 # This does not work unless the redirect_facility below is set to
 # something other than the default 'static'
-  latest_version_segment_strategy: redirect:from
+  latest_version_segment_strategy: redirect:to
 # If this is set to 'httpd', antora will create a .htaccess file with all redirects, including 'latest'.
 # Default is 'static' which produces index.html at the root.
 # See https://docs.antora.org/antora/latest/playbook/urls-redirect-facility/