I want to let anonymous visitors of my site based on Jekyll-Github-Pages do some edits without logging in. 
Here is sample page which is must easy switched to Prose.io interface with the following link:
[Edit](http://prose.io/#indexmod/{{site.repo}}/edit/{{site.branch}}/{{page.path}})
This link just redirects to the page of Prose.io with the list of all my Github projects instead of page.path.
The question is how to modify this link to point editor to same page and let the editor do changes and push them without any authorization?