WEBSITE UPDATE
Folks watching this space know that for a while I've been looking for ways to make the content on opensiddur.org "site-neutral." Opensiddur.org currently runs on a Wordpress site which means all its data is stored in a MySQL database on the site's backend. While theoretically, that database is accessible by Wordpress's REST API, I've been keen to make sure that all the content on opensiddur.org is practically accessible through an easily downloadable public repository. I also have my eye on a future when Efraim Feinstein's app.opensiddur.org will be able to make use of the last ten years of content shared from opensiddur.org -- on our way to realizing our Open Siddur builder application.
tl;dr -- You can now download or navigate through all our site's posts via https://github.com/aharonium/opensiddur.org
The posts are preserved as simple HTML pages. They each have a markdown (.md) extension that enables them to be viewable through github's frontend.
This isn't the first time I've attempted this, but I've had much more success on this latest try using a python script to parse the XML file that Wordpress generates. I update this script here: https://gist.github.com/aharonium/1d148b57e2b8488f68e2f2781ce92e00
The closest I've come to bootstrapping from an XSLT solution is via this script: https://www.oipapio.com/question-361474
There is still work to be done to make the python script we're using for this process more robust, so please speak up if you'd like to help with this task. (Co-authors, categories, tags, license and attribution metadata isn't being parsed out from the XML yet.) If you have experience parsing XML via python or XSLT, let me know.