It’s a voltage divider circuit. Will that not work? Do I not need that?
No need, it won’t do any harm I don’t think but all you need is a single current-limiting resistor. 680 would be too high for 3v3 I think but I don’t know what the IRLED spec is.
I thought it would be a good precaution to make sure that the pin is low to start with.
It’s an input being pulled low so the write is both unnecessary and will do nothing anyway.
If however you write a HIGH to the pin you can turn on the internal pull up resistor, by doing that, reversing your wiring, and doing
attachInterrupt (0, home, FALLING);
you can get rid of the 10k resistor.