Removed Pyret and added some things to the change log (#425)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Removed Pyret resource documentation and references from course setup
materials; Pyret is no longer offered as a resource option.
* Updated release notes/changelog: added an entry noting Pyret support
deprecated, reordered October items, and added September entries
(including option to show expected answer and rationale when grades are
released).
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: shajason

source/instructors/getstarted/support/changelog.rst

@@ -15,11 +15,16 @@ We do not report small bug fixes or issues that affect individual users, who we
 
 **October 2025**
 
-- `[I] [22th]`: Pagination is now persistent across pages.
+- `[I] [24th]`: Pyret support has been deprecated.
+- `[I] [22nd]`: Pagination is now persistent across pages.
 - `[I] [20th]`: Added support for the Math markdown code block.
 - `[I] [14th]`: Behavior insight information is available in the assignment CSV file. :ref:`Assignment data <export-assignment>`
 - `[I] [9th]`: New Guides button for :ref:`uploading files<upload-file-button>`.
 
+**September 2025**
+
+- `[I] [29th]`: Option added to display expected answer and Rationale when grades have been released.
+
 **July 2025**
 
 - `[I] [30th]`: If a student tries to log in when they have an uncompleted assignment in Single Login mode, they have the option to mark that assignment as complete.

source/instructors/setupcourses/resources/resourcetools/crunch.rst

@@ -15,7 +15,6 @@ Additional resources
    scratch
    pencilcode
    draw-io
-   pyret
    tkinter
    turtle
    processing-and-p5