Previously, we uploaded the main Firefox tree docs to /.
In reality, there are multiple Sphinx projects in the repo. In
addition, it is sometimes desirable to access docs for an older
version of Firefox.
In this commit, we add support for specifying the S3 key prefix
for uploads. Then we change the upload code to upload to multiple
locations:
* <project>/latest (always)
* <project>/<version> (if a version is defined in the Sphinx config)
* / (for the main Sphinx docs project)
For the Firefox docs, ``version`` corresponds to a sanitized value from
``milestone.txt``. Currently, it resolves to ``57.0``.
While we're here, we add support for declaring an alternate project
name in the Sphinx conf.py file. If ``moz_project_name`` is defined,
we use that as the project name. For Firefox, we set it to ``main``.
This means our paths (local and uploaded) are now ``main`` instead of
``Mozilla_Source_Tree_Docs``. That's much more pleasant.
MozReview-Commit-ID: 8Gl6l2m6uU4
Instead of doing the file finding inside s3_upload(), the function now
takes the output of distribution_files().
The new code is much simpler.
MozReview-Commit-ID: 43i2Alvyu5i
