Replace Logs in Admin Settings with icewind's Log reader

[MariusBluem]

Since Nextcloud 10 and its split of the admin page, the log reader has enough space to show up more and advanced information ... Like the log reader app (https://github.com/icewind1991/logreader) already does 😉

I think we should integrate this directly into the administrator page.

cc @icewind1991 @blizzz @nextcloud/designers

Follow up of: #712 (comment)

[MorrisJobke]

Done - see #2134 and #2214