Ability to use custom components

I get that the idea of this project was to quickly and easily have UI with minimal effort. However, the email & password UI does not match the theme of my website (text fields, labels etc). The CTA to initiate an email & password is good. Would it be possible to have the ability to use a custom component rendered instead?

首先检查 React wrapper 如何暴露和渲染电子邮件与密码 UI，然后确定在允许自定义组件的同时，现有流程中的哪些部分必须保留。完成意味着用户可以替换主题化字段和标签，同时不会丢失电子邮件/密码 CTA 流程；issue 未指定任何文件或测试。

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