No, Nixon resigned before the impeachment vote.
Impeachment is by the House of Representatives. To kick out a President there needs to be a 2nd stage - conviction by 2/3rds of the Senate.
A very good move.
The more info that comes out shows that this was an organised attempt at insurrection and rebellion.
Unfortunately it is unlikely that 2/3rds of the Senate will convict him, but nevertheless, an impeachment on such crimes by the House of Representatives matters.