Improve the way the link to minerva is handled

Currently, the redirection is generated by https://git-r3lab.uni.lu/core-services/r3lab/r3-pages/-/blob/master/link_to_minerva.md

then in gitlab-ci:

mkdir -p ~/web/latest/web/minerva-website && ln -fs ~/web/latest/link_to_minerva.html ~/web/latest/web/minerva-website.html && ln -fs ~/web/latest/link_to_minerva.html ~/web/latest/web/minerva-website/index.html

The link itself cannot be written to the /web/minerva-website/index.md file, because that breaks the CI/CD script.

This should be done in a better way. My first idea was to create a separate repository for minerva-website redirection, so that it would follow the same pattern that other websites use (TGM pipeline, IMP-doc etc.)