doc: note on branch names

doc/source/index.rst

@@ -171,6 +171,21 @@ map (override) specific files from your directory with arguments like this to
 This will map your new ``main.py`` to the containers ``/app/main.py``.
 
 
+Deployment
+----------
+
+Create a repository on `git.archive.org`, under the right namespace (reach out
+to the Petabox team to figure out what it is, it might be `www/`). Then pick
+names for your testing and production branches. A recommendation could be
+`testing` and `production`: meaning that only commits pushed to any of those two
+branches have a chance of being picked up by the production environment (and
+thus, pushing to `master` does not trigger a deploy). Then communicate those
+branch names to the petabox team.
+
+The `testing` branch can then be selected for a derive by passing the
+`test_serverless` argument with the value `on` to the task arguments.
+`production` will then be the default branch.
+
 
 General Deriver Module Guidelines
 ---------------------------------
@@ -207,7 +222,7 @@ mind:
 Modules using derivermodule
 ---------------------------
 
-The following deriver module make use of this library:
+The following projects make use of this library:
 
 * https://git.archive.org/www/tesseract
 * https://git.archive.org/www/pdf