[refactor] rewrite Election model with Web Crypto API

[](https://github.dev/kaiyuanshe/kaiyuanshe.github.io/pull/381) [](https://codespaces.new/kaiyuanshe/kaiyuanshe.github.io/pull/381) [](https://gitpod.io/?autostart=true#https://github.com/kaiyuanshe/kaiyuanshe.github.io/pull/381) [<img width="16" alt="Powered by Pull Request Badge" src="https://user-images.githubusercontent.com/1393946/111216524-d2bb8e00-85d4-11eb-821b-ed4c00989c02.png">](https://pullrequestbadge.com/?utm_medium=github&utm_source=kaiyuanshe&utm_campaign=badge_info)<!-- PR-BADGE: PLEASE DO NOT REMOVE THIS COMMENT --> 1. [refactor] rewrite Election model with Web Crypto API (fix #380) 2. [optimize] update Upstream packages