Edit button to take it to github editor

[digikar99]

Hi! Thank you for this theme, it is very cool!

I was wondering if it might be possible to implement an edit button that takes the user to the corresponding page on github. With such a button, users can easily make changes to the respective page directly in the browser, through the github editor.

I don't see this on the demo site, so I don't know if this already exists.

An example is on the docsy theme - on the right sidebar on desktop, one can see the 'Edit this page' link.