ci: update image locations

---

docs:pandoc-from-template:

  image:

    name: registry.gitlab.com/notno/pandoc

    name: registry.gitlab.com/just-ci/images/pandoc:latest

    entrypoint: [""]

  variables:

    FORMATS: pdf docx html

# The job name must be pages for it to work.

pages:

  image: registry.gitlab.com/notno/hugo

  image: registry.gitlab.com/just-ci/images/hugo:latest

  # Add a before script to add an external theme, for example:

  # before_script:

  #   - git clone https://github.com/matcornic/hugo-theme-learn.git themes/hugo-theme-learn