Post: redirecting / to README.html deprecation (#287)

* Post: redirecting `/` to `README.html` deprecation

Related readthedocs/readthedocs.org#9993

* Small change

* Add tip

* Send email on Tuesday

* Update content/posts/readme-html-deprecated.md

Co-authored-by: Eric Holscher <[email protected]>

---------

Co-authored-by: Eric Holscher <[email protected]>

Author: humitos

content/images/readme-html-deprecated.jpg

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+title: Deprecation: Removal of redirect for root documentation URL to "README.html"
+date: 2024-05-27
+category: Changelog
+tags: hosting, deprecation
+authors: Manuel Kaufmann
+status: published
+image: /images/readme-html-deprecated.jpg
+image_credit: Photo by <a href="https://unsplash.com/@introspectivedsgn?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Erik Mclean</a> on <a href="https://unsplash.com/photos/black-asus-laptop-computer-showing-3-00-sxiSod0tyYQ?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Unsplash</a>
+
+We are announcing the **deprecation of redirecting root URLs (`/`) to `/README.html`**
+for all the projects that don't output an `index.html` file when building the documentation.
+The deprecation date is set on **Monday, July 1st, 2024**.
+After this date, projects not outputting an `index.html` file will [fail their builds](https://blog.readthedocs.com/builds-without-index/).
+
+### Deprecation timeline
+
+We understand this change will affect a few hundred of projects, so we have a timeline to communicate this deprecation to our users effectively.
+
+* **Tuesday, May 28, 2024**: Email project owners using this deprecated feature so they can take action.
+* **Monday, June 10, 2024**: Do the first brownout (temporarily enforce this deprecation) for 12 hours: 00:01 PST to 11:59 PST (noon)
+* **Monday, June 17, 2024**: Do a second brownout (temporarily enforce this deprecation) for 24 hours: 00:01 PST to 23:59 PST (midnight)
+* **Monday, June 24, 2024**: Do a third and final brownout (temporarily enforce this deprecation) for 48 hours: 00:01 PST to 23:59 PST (midnight)
+* **Monday, July 1, 2024**: Fully remove support for building documentation without configuration file v2.
+
+We strongly recommend to update your projects before July 1st, 2024 to avoid any downtime.
+
+### How to update your project
+
+There are different approaches that can be followed depending on the configuration of your project.
+
+1. Migrate your Sphinx documentation to use `master_doc = "index"` instead of `master_doc = "README"`.
+   This can be done by re-structuring your documentation or by creating a symlink from of `index.rst -> README.rst`.
+2. Rename the `README.html` as `index.html` once the build has finished using [`build.jobs.post_build`](https://docs.readthedocs.io/en/stable/config-file/v2.html#build-jobs)
+
+Note these are only two possible ideas, but there may be other ways to achieve the same goal.
+
+> _**Tip**: you can create a redirect from `/README.html` to `/` to keep links pointing to the deprecated URL working._
+
+[Contact us](https://readthedocs.org/support/) if you have any questions,
+and let us know any inconvenient you may have with this change.