Example delete and undelete flow when storing posts as flat files:
• Create a post on disk stored at e.g. `/web/2017/10/15/1/post.txt` which has a public URL of `http://example.com/2017/10/15/1/`
• When the client deletes the post, the server moves the file to `/web/.trash/2017/10/15/1/post.txt`
• If the client sends an undelete request, the request will include the former public URL of the file `http://example.com/2017/10/15/1/`
• Similar to how the server knows where to find the file for live posts, it should know how to find the post in the trash folder if it's been deleted
• The server can move the file back to the public folder `/web/2017/10/15/1/post.txt` to complete the undelete
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