RE: 2 week ceasefire in the Middle East, after Trump threatened to destroy "a whole civilization". MAGA supporter Alex Jones and others demanding 25th amendment (JD Vance to take over).

Article 25 is not the same as a Impeachment. So far, it had never been used. There are several steps as outlined here:
https://constitution.congress.gov/constitution/amendment-25/
Go to Section 4 - it tells you how this works in the case the Whacko in the Oval Office goes totally bonkers, as is the case now.