Add release note for the removal of screenshot support

docs/release-notes/remove-screenshot-support.rst

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+:Type: GUI
+:Summary: Remove screenshot support
+
+:Description:
+    It was previously possible to take a screenshot of the
+    Anaconda GUI by pressing a global hotkey. This was
+    never widely advertised & rather hard to use for anything
+    useful, as it was also necessary to manually extract the
+    resulting screenshots from the installation environment.
+
+    Furthermore, with many installations happening in VMs,
+    it is usually more convenient to take a screenshot using
+    the VM software anyway.
+
+    By dropping screenshot support, we can remove dependency
+    on the ``keybinder3`` library as well as the necessary
+    screenshot code in the GUI.
+
+:Links:
+    - https://github.com/rhinstaller/anaconda/pull/5255