Add voting alert

[nancy919]

1. Time: Click on the button "voting alert" to push immediately
2. address: go to icpdao discord # Vote alert channel
3. Content: @xxx @xxx @xxx ICPDAO Voting time has started, please finish voting and sign from 2021.9.1 24:00 to 2021.10.1 12:00 (UTC+8); Note that if you miss the voting time, the size will be 0 votes. Click the link to go to vote immediately: https://app.icpdao.co/home