Unescaped ampersand in Atom feed

[LinAGKar]

There is an unescaped ampersand in <link href="https://k9mail.app/2023/12/28/K-9-Mail-in-November-&-December-2023.html" in the Atom feed at https://k9mail.app/feed.xml, which makes it fail to parse.

[siccovansas]

My RSS reader also fails to parse the feed. The W3C Feed Validation Service confirms that the feed does not validate.

line 21, column 717: XML parsing error: :21:717: not well-formed (invalid token) [help]
... il.app/2023/12/28/K-9-Mail-in-November-&-December-2023.html" rel="altern ...