* Fix handling of displayURLs which are strings
* Add fromFetchArguments to unsentRequest
* Add parseLinkHeader to backendUtil
* Handle paginated endpoints in GitHub API
* Rename fork workflow to Open Authoring across the whole repo
* Fixes for bugs in GitHub API introduced by Open Authoring changes
* Fix getDeployPreview
* Fix incorrect auth header formatting GitHub implementation
cf. https://github.com/netlify/netlify-cms/pull/2456#discussion_r309633387
* Remove unused and broken method from GitHub API
cf. https://github.com/netlify/netlify-cms/pull/2456#discussion_r308687145
* Fix editorialWorkflowGit method in GitHub API
* Request published entry content from origin repo
* Better error when deleting a published post in Open Authoring
* Rename to Open Authoring in fork request message
Also adds a note to the fork request message that an existing fork of
the same repo will be used automatically.
* fix linting
