docs: add release note for the hidden-webui-pages configuration option

docs/release-notes/hidden-webui-pages.rst

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+:Type: Configuration
+:Summary: Support for Hiding Specific Pages in the Web UI
+
+    :Description:
+    The Web UI now supports hiding specific pages by adding their page IDs to the
+    hidden-webui-pages option in the anaconda.conf file.
+
+    For example, in the Workstation ISO, the 'Account Creation' page shoult not be displayed,
+    as this step is handled by GNOME Initial Setup during first boot. To hide this page,
+    the following configuration is be added:
+
+    hidden-webui-pages = anaconda-screen-accounts
+
+    This feature allows tailoring the Web UI experience to meet the specific needs of
+    different ISOs or spins.
+
+:Links:
+    - https://github.com/rhinstaller/anaconda/pull/6047