Post: doctools without configuration file deprecation announcement (#229

)

* Post: doctools without configuration file deprecation announcement

Follows readthedocs/readthedocs.org#2483

* Adding the updated content from the HackMD.

* Fix RST

* Fix link

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Co-authored-by: Eric Holscher <25510+ericholscher@users.noreply.github.com>

doctool-without-configuration-file.rst

@@ -0,0 +1,26 @@
+.. post:: July 12, 2023
+   :tags: builders
+   :author: Manuel
+   :location: BCN
+   :category: Changelog
+
+Doctools without configuration file (`conf.py` / `mkdocs.yml`) are deprecated
+=============================================================================
+
+Historically Read the Docs has created a `conf.py` file for Sphinx projects and a `mkdocs.yml` file for MkDocs projects that don't provide one,
+to make onboarding easier. 
+This has been confusing a lot our users in different ways and **we will remove the auto-creation of a default Sphinx/MkDocs configuration file for projects that don't have one on August 28th**. 
+To avoid unexpected behavior or your documentation builds failing, 
+you should add a configuration file to your project by this date.
+
+The auto-creation of a default configuration file will be completely removed on **August 28th**. Add a `conf.py`/`mkdocs.yml` to your projects before this date to avoid unexpected build failures.
+
+You can find a good example of a basic configuration file in our :doc:`example projects <readthedocs:examples>`:
+
+* Sphinx `example conf.py <https://github.com/readthedocs-examples/example-sphinx-basic/blob/main/docs/conf.py>`_
+* Mkdocs `example mkdocs.yml <https://github.com/readthedocs-examples/example-mkdocs-basic/blob/main/mkdocs.yml>`_
+
+Please `contact us`_ about any issues you have regarding change.
+
+.. _contact us: mailto:hello@readthedocs.org
+