GitLab

Resolve "Améliorer le retour d'erreur sur les pages de contenu"

Closes #4

See merge request !2

Resolve "Ajouter une page de connexion pour les utilisateurs"

Closes #3

See merge request !1

1. Allow multiple & independant search in menu panels
2. Allow to use the title as a link (UX can be improved)

Now that the user session is kept between requests (FrontAuthenticator
is called only once), there is no need to keep passing by the user api
key.

- Use VueJS for searchable panel instead of angularjs
- Use a class instead of :target to show the menu