rsyslog/rsyslog_doc_gen_website image has outdated "Better" theme

[deoren]

Backstory

See irskep/sphinx-better-theme#32 for details, but due to how PyPi handled the version of the older package and the newer, the old package was installed by default unless the user opted to override it with the latest version. The package maintainer removed the old version (0.13) so that only the newest one (0.1.5) is available via PyPi.

The changes since that version are listed here:

https://sphinx-better-theme.readthedocs.io/en/latest/

Situation

I checked and have confirmed that the old version of the sphinx-better-theme package is installed in the rsyslog/rsyslog_doc_gen_website image.

Opening this ticket in order to have the Docker image updated to include the latest version.

Proof

Output from testing/checking the version:

ubuntu@ubuntu-1604-virtual-machine:~/Desktop$ sudo docker pull rsyslog/rsyslog_doc_gen_website

Using default tag: latest
latest: Pulling from rsyslog/rsyslog_doc_gen_website
2fdfe1cd78c2: Pull complete 
1cd4a3ec306a: Pull complete 
24fcc0ddf03d: Pull complete 
43c871a80e9b: Pull complete 
67ae96d55649: Pull complete 
c239b83d8d92: Pull complete 
4fc5cdc94999: Pull complete 
7427d256772d: Pull complete 
d9cfd4dc9e81: Pull complete 
Digest: sha256:e49dde128a2ba3a5d3b7e5af9b63fbd714735159cf252440009c0155c990585e
Status: Downloaded newer image for rsyslog/rsyslog_doc_gen_website:latest
ubuntu@ubuntu-1604-virtual-machine:~/Desktop$ sudo docker run -ti rsyslog/rsyslog_doc_gen_website bash
You are now in Alpine's ash

/home/appliance # pip list

DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
alabaster (0.7.10)
Babel (2.5.3)
certifi (2018.1.18)
chardet (3.0.4)
docutils (0.14)
idna (2.6)
imagesize (0.7.1)
Jinja2 (2.10)
MarkupSafe (1.0)
pip (9.0.1)
Pygments (2.2.0)
pytz (2018.3)
requests (2.18.4)
setuptools (33.1.1.post20171031)
six (1.11.0)
snowballstemmer (1.2.1)
Sphinx (1.6.7)
sphinx-better-theme (0.13)
sphinxcontrib-websupport (1.0.1)
typing (3.6.4)
urllib3 (1.22)