希望增加页面合并（merge）功能 #47
Description
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What Happened?
这个功能在 MD 版本中有，但在DB版本中还没有实现。重命名页面遇到重名时会提示存在相同名称的页面，而不是像MD版本中那样提示是否合并页面。
Reproduce the Bug
如上
Expected Behavior
如上
Screenshots
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Browser, Desktop or Mobile Platform Information
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Additional Context
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Are you willing to submit a PR? If you know how to fix the bug.
- I'm willing to submit a PR (Thank you!)