I use the stackexchange app and was wondering if there is a quick way to scroll down all the way to the first question ever asked on Mi Yodeya?
(This question really applies to all the other forums as well)
I don't think so. But if you use the web version, click on Questions, sort by newest (on top), go to the very bottom and click on the last number (816 today).
It's the first post (question or answer), too, so its post number is 1. On the Web, you'd try
https://judaism.stackexchange.com/q/1. I don't know whether that's doable in the app, not having used it.