feat(gallery): unlock gallery information panel

[ghost]

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What kind of change does this PR introduce? (check one with "x")

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Description

解锁"图库"页面被注释的信息面板并在设置里添加一些项目, 且使用Formspree作为邮件转发服务.
注: Formspree功能未经测试. (懒.jpg)

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