Info for editing an existing post should include a link to the post

[Albin Zehe]

When using a browser extension to add an already existing post, an information

note: You are editing an existing post.

The post you posted already exists in your repository. You are now editing this version of the post.

is shown. It would be nice to have a link to the existing post in this information.

[Albin Zehe]

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