Update .gitlab-ci.yml to use a more recent Hugo image and theme

Anne Gentlerequested to merge
annegentle/hugo:annegentle-main-patch-27941 into main

This change uses a more recent Hugo container image and makes sure the Ananke theme URL works by appending the /v2.

Related to Issue gitlab-org/gitlab#506397.

Closes #95 (closed)

Edited by Achilleas Pipinellis

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