Add mastodon.el

Doesn't work right now, but that's my fault.

init.el

@@ -1015,6 +1015,13 @@ if ripgrep is installed, otherwise `consult-grep'."
                                    marginalia-annotators-light))
   (marginalia-mode +1))
 
+(setup (:straight (mastodon
+                   :host github
+                   :repo "mooseyboots/mastodon.el"))
+  (:option mastodon-instance-url "https://writing.exchange"
+           mastodon-auth-source-file (car auth-sources)
+           mastodon-client--token-file (acdw/dir "mastodon.plstore")))
+
 (setup (:straight (modus-themes
                    :host gitlab
                    :repo "protesilaos/modus-themes"))