Allow users to configure their privacy settings

Users should be able to configure what parts of their profile are visible to the public. Currently all users' first and last names are visible in the project gallery, but they should be able to choose to be anonymous, or perhaps also show some contact info.

Once #31 is complete and the Privacy tab exists under the account dashboard, we should add a section to configure which details of a user are public. Initially it could be the following:

- First name (on by default)
- Last name (on by default)
- Email (off by default)

首先查看 issue #31，以及引入 Privacy 选项卡的账户仪表板相关工作；这里没有列出文件或测试。追踪个人资料详细信息在项目画廊中的显示方式，并确定提议的三个可见性选项应放在哪里。完成标准是用户可以使用所述默认值配置名字、姓氏和电子邮件的可见性，并且画廊遵循这些选择。

由索引模型根据 Issue 内容生成。