Deprecate Jquery

Jquery was included by default in Ember.js. Though it has served its purpose well, current state of ember and browsers no longer needs Jquery. Ember also has officially [deprecated Jquery](https://github.com/emberjs/rfcs/blob/master/text/0386-remove-jquery.md), we also wish to do the same.

Task: Remove all usages of jQuery throughout the project. One way to get started is to remove `@ember/jquery` package from package.json and re-rerun `yarn install` and check for errors due to absence of Jquery and fix them with suitable Vanilla JS / Ember code.

从 package.json 开始，移除 @ember/jquery 包，然后运行 yarn install，并检查产生的错误以找出剩余的 jQuery 使用。将这些使用替换为合适的 Vanilla JS 或 Ember 代码；当项目不再使用 jQuery 且能够在没有所报告错误的情况下完成安装时，即表示完成。

由索引模型根据 Issue 内容生成。