What happens if Biden dies before the next inauguration (see inside)?

What happens to the election if Biden dies before it?

• With considerable time til the election
• Not enough time to change the election

Assuming Biden wins on election day, what is the procedure at various stages throughout the election if Biden dies?

• After election day but before votes are counted
• Votes counted but not certified by Congress
• Certified but not inaugurated
• Any other stages I've missed