Resolve "Update Neutrinet app in our Yunohost packages list"

Closes #1 (closed)

Improvements of !31 (merged)

Note: We should check if build_neutrinet_ynh.sh can be there without any risk (as it will be on the Neutrinet web server, I don't know if it could be executed or something like that)

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@ilja As I cannot update your branch, I had to make a new branch and merge request…

You should consider creating branches within the Neutrinet repos, instead of forking them ^^
For instance, you can do:

git checkout -b some-new-branch
git add ...
git commit ...
git push origin some-new-branch

Normally you should have the rights to push into Neutrinet repos.