Move to README

Author: hugovk

README.md

@@ -51,3 +51,20 @@ of Sphinx we're using where:
     3.13       8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3    8.1.3  8.1.3  8.1.3    8.1.3
     3.14       8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3  8.1.3    8.1.3  8.1.3  8.1.3    8.1.3
     =========  =====  =====  =====  =====  =====  =====  =====  =====  =======  =====  =====  =======  =======
+
+## Manually rebuild a branch
+
+Docs for [feature and bugfix branches](https://devguide.python.org/versions/) are
+automatically built from a cron.
+
+Manual rebuilds are needed for new security releases,
+and to add the end-of-life banner for newly end-of-life branches.
+
+To manually rebuild a branch, for example 3.11:
+
+```shell
+ssh docs.nyc1.psf.io
+sudo su --shell=/bin/bash docsbuild
+screen -DUR  # Rejoin screen session if it exists, otherwise create a new one
+/srv/docsbuild/venv/bin/python /srv/docsbuild/scripts/build_docs.py --branch 3.11
+```