[Documentation:InstructorUI] Gradeable Config Editor (#707)

Added documentation for the gradeable config editor. I'm unsure if the
pictures make the instructions too explicit, but I figured I'd leave
that up to discussion.

---------

Co-authored-by: Barb Cutler <[email protected]>

Author: JManion32

_docs/instructor/assignment_configuration/configuration_editor.md

@@ -0,0 +1,29 @@
+---
+category: Instructor > Assignment Configuration Editor
+title: Configuration Editor
+---
+
+The Gradeable Autograding Configuration Text Editor allows instructors to quickly view and make minor adjustments to a gradeable’s autograding configuration directly on the site. It can be found below the [autograding upload section](https://submitty.org/instructor/assignment_configuration/configuration_path) on the `Submissions / Autograding` page within a gradeable’s settings.
+
+![](/images/instructor/assignment_configuration/gradeable_config_editor.png)
+
+### Features
+
+#### Adding Directories & Files
+You can add new directories to the root level, and add individual files either to the root level or within existing folders. If you need to add a folder that already contains files, consider re-uploading the configuration instead.
+
+#### Removing Directories & Files
+
+You can delete individual files or entire directories from the configuration as needed. **_Note: Deleting a directory will also remove all of its contents!_** By design, you cannot delete the entire configuration or the `config.json` file.
+
+#### Downloading Configuration
+Download a ZIP file of your current configuration by clicking the download icon next to the folder. This download button is also next to the configuration on the autograding upload page.
+
+#### Customizing the Editor
+The text editor uses CodeMirror to enhance the editing experience. Use the buttons in the top-right corner of the text editor to:
+1. Toggle line number visibility.
+2. Switch the tab size between 2 and 4 spaces.
+
+---
+
+_Note: This feature is only available for uploaded configurations. It does not yet support configurations pulled from the private courses repository._

images/instructor/assignment_configuration/gradeable_config_editor.png

@@ -119,6 +119,7 @@ var NAVTREE =
             ] ],
             [ "Assignment Configuration", "/instructor/assignment_configuration/configuration_path", [
                 [ "Configuration Path","/instructor/assignment_configuration/configuration_path", null],
+                [ "Configuration Editor", "/instructor/assignment_configuration/configuration_editor", null ],
                 [ "Notebook", "/instructor/assignment_configuration/notebook", null ]
             ] ],
             [ "Autograding", "/instructor/autograding/directory_structure", [