Solr Website now built by Github Actions

Hi, Quick update on the build process for solr website -- https://github.com/apache/solr-site Earlier the Pelican based site was built by ASF buildbot and handled by special .asf.yaml sections. Now it is built with Github Actions, see SOLR-17339

Re: Solr replication threads blocking each other causing large delays

probably the easiest way to get input on this one is to find what seems to be the cause of what looks like global lock behavior and then mention that cause here. No, you wouldn't expect replication to take turns and go one at a time, but you're more likely to get relevant feedback if you can point