fix(Sphynx config): Use 'sphinx_rtd_theme' instead of 'alabaster' theme.
Don't use alabaster
theme: since version 0.7.14
, alabaster
requires at least Sphynx 3.4
and the CI is currently pinned to Sphynx 1.8.5
.
The relevant alabaster changelog: https://alabaster.readthedocs.io/en/latest/changelog.html
An example of a CI job broken by the update of alabaster
: https://git.xfel.eu/Karabo/Framework/-/jobs/556501.
The relevant portion of the broken job output:
Sphinx version error:
The alabaster extension used by this project needs at least Sphinx v3.4; it therefore cannot be built with this version.