Update pages ci templates - Doxygen, HTML, Harp

What does this MR do and why?

Update pages ci templates - Doxygen

Template	Existing example project	Test project with successful pipeline	Deployed test project
Doxygen	https://gitlab.com/pages/doxygen/-/blob/master/.gitlab-ci.yml?ref_type=heads	https://gitlab.com/ngala/ngala-doxygen	https://ngala.gitlab.io/ngala-doxygen/
HTML	https://gitlab.com/pages/plain-html/-/blob/main/.gitlab-ci.yml?ref_type=heads	https://gitlab.com/ngala/ngala-html	https://ngala.gitlab.io/ngala-html/
Harp	https://gitlab.com/pages/harp/-/blob/master/.gitlab-ci.yml?ref_type=heads	https://gitlab.com/ngala/ngala-harp	https://ngala.gitlab.io/ngala-harp/

Related: Pin versions in pages templates (#377585 - closed)

Changelog: fixed

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