Add Sept 2023 newsletter

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newsletter-september-2023.rst

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+.. post:: September 5, 2023
+   :tags: newsletter, python
+   :author: Anthony
+   :location: GEG
+   :category: Newsletter
+
+Read the Docs newsletter - September 2023
+=========================================
+
+News and updates
+----------------
+
+- 🚀 :doc:`We started testing a new flyout menu </addons-flyout-menu-beta>`
+  as part of our beta test for documentation addons.
+  The beta test is currently limited to projects using the ``build.commands``
+  configuration key.
+
+- 🛣️ We continue to have a number deprecations in progress.
+  We announced this month deprecations of :doc:`installing using system packages </drop-support-system-packages>`,
+  :doc:`the configuration key build.image </use-build-os-config>`,
+  and :doc:`installation of pinned versions of Sphinx and MkDocs </defaulting-latest-build-tools>`.
+  Keep an eye on your email for any deprecation notifications,
+  as we will continue to notify maintainers of projects that might be impacted.
+
+- 📚 The Read the Docs Sphinx theme package, ``sphinx-rtd-theme``, had two releases.
+  Version 1.3.0 was released, adding support for Sphinx 7.0.
+  Version 2.0.0rc2 is also now out.
+  This is a release candidate that will remove support for HTML4 output and will drop support for Sphinx versions prior to 5.0.
+  We will be announcing the release candidate more this month and will be looking to have feedback from users.
+
+- 🔐 `A security advisory involving symlink abuse`_ during project builds was raised and patched.
+
+- 📉 Changes to our request handling resulted in a 30% reduction in response times for 404 error responses.
+
+    .. figure:: /img/2023-september-404.png
+
+       Request times for 404 handling have dropped 30% since last release.
+
+- 🏁 Updates to Proxito are now fully rolled out to |org_brand| and |com_brand|.
+
+- ✨ We upgraded our application to use Django 4.2.
+
+.. _A security advisory involving symlink abuse: https://github.com/readthedocs/readthedocs.org/security/advisories/GHSA-v7x4-rhpg-3p2r
+
+Upcoming changes
+----------------
+
+- ⚠️  In line with :doc:`our deprecation plans for builds without a configuration file </migrate-configuration-v2>`,
+  projects will be required to specify a configuration file to continue building their documentation starting September 25th.
+  Our last brownout date is September 4th, lasting 48 hours.
+  To avoid any problems building your project,
+  ensure it has a configuration file before then.
+
+- 🚢️ We will be continuing our work on for our beta test of `Read the Docs Addons <https://github.com/readthedocs/addons>`__.
+  Our focus is still on improving the new flyout menu, search, and adding more new features.
+
+- 🛠️ Our new dashboard, currently available for beta testing at https://beta.readthedocs.org,
+  will receive some small feature additions, and we are working towards a beta of the new dashboard for |com_brand| as well.
+  We expect to have more news here in the coming months.
+
+Want to follow along with our development progress? `View our full roadmap 📍️`_
+
+.. _View our full roadmap 📍️: https://github.com/orgs/readthedocs/projects/156/views/1
+.. _reach out: https://readthedocs.org/support/
+
+Possible issues
+---------------
+
+- ⚠️ Make sure to follow directions from notifications regarding deprecations.
+  We have notified project maintainers for any project that could be affected by one of our ongoing deprecations.
+  Updating your package ahead of brownout dates and final deprecation cutoff dates will ensure your project continues to successfully build.
+
+-------
+
+Questions? Comments? Ideas for the next newsletter? `Contact us`_!
+
+.. Keeping this here for now, in case we need to link to ourselves :)
+
+.. _Contact us: mailto:hello@readthedocs.org
+