Tart blog rss feed invalid

[matthewruzzi]

The Tart blog rss feed does not validate.

https://tart.run/feed_rss_created.xml
https://validator.w3.org/feed/check.cgi?url=https://tart.run/feed_rss_created.xml

[edigaryev]

Related upstream issues:

• Configuration mismatch between site_author and managingEditor Guts/mkdocs-rss-plugin#192

[fkorotkov]

Should we change the author to hello-at email as a workaround?