"Synchronizing with Thunderbird" page out-of-date: Thunderbird has CardDAV support

[MMachado05]

This page on how to synchronize Nextcloud contacts with Thunderbird is a few years out of date, as it recommends installing an add-on that stopped receiving support years ago due to the Thunderbird application getting native support for the functionality it provided. The page should likely be updated to reflect this so that newcomers to Nextcloud will be able to sync their Nextcloud servers with the Thunderbird email client.

[joshtrichards]

Those are ancient docs (for NC 19). That page doesn't exist any longer (in more current versions of the manual) and was replaced by this:

https://docs.nextcloud.com/server/latest/user_manual/en/groupware/sync_thunderbird.html